diff --git a/src/test/resources/de/hhu/stups/codegenerator/Generated100.mch b/src/test/resources/de/hhu/stups/codegenerator/Generated100.mch
index 4d782cc77b7287a2ac309960874828088b7d6851..52c0f94dbd009b4953f2228ec655207833cb68d5 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/Generated100.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/Generated100.mch
@@ -1,3 +1,6 @@
+/*
+From ProB Examples
+*/
MACHINE Generated100
CONSTANTS
c100,
diff --git a/src/test/resources/de/hhu/stups/codegenerator/INTEGERSET_Laws.mch b/src/test/resources/de/hhu/stups/codegenerator/INTEGERSET_Laws.mch
index eff993f40b7247d94c99faab283b9c63ba342d37..75c6e21d0ca1a9d12a60e893ed4caf5eddb4efde 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/INTEGERSET_Laws.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/INTEGERSET_Laws.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE INTEGERSET_Laws
INVARIANT
(0..4 = 1..4 \/ {0}) &
diff --git a/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow.mch b/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow.mch
index c31ed8ae2bde0a3cb30982f8b9ee61d03db71792..96975e52b182243b5988753b13c4f52b5f369417 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow.mch
@@ -1,3 +1,6 @@
+/*
+From ProB Examples
+*/
MACHINE IncrementalStatePackingTestLargeSlow
SETS
ID={aa,bb,cc}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow2.mch b/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow2.mch
index 3bac7243a69af1100853335786767209c0cd2ac5..ebd4c606e838807bd09c0879d1d55287f3a7d80e 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow2.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/IncrementalStatePackingTestLargeSlow2.mch
@@ -1,3 +1,6 @@
+/*
+From ProB Examples
+*/
MACHINE IncrementalStatePackingTestLargeSlow2
SETS
ID={aa,bb,cc}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/NatRangeLaws.mch b/src/test/resources/de/hhu/stups/codegenerator/NatRangeLaws.mch
index 0a110e423ec3eb64e89dd62b4ca1f86d5302b374..9f99738b14bf2f7f42bc7f5dae263c9386de0f56 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/NatRangeLaws.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/NatRangeLaws.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE NatRangeLaws
VARIABLES xx,zz
INVARIANT
diff --git a/src/test/resources/de/hhu/stups/codegenerator/Ref5_Switch.mch b/src/test/resources/de/hhu/stups/codegenerator/Ref5_Switch.mch
index abd6e688fd1ad3b86239094b4a502e8175023f1a..5a52b76a8cac96ab9764eb7b5daa68abc896222e 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/Ref5_Switch.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/Ref5_Switch.mch
@@ -1,4 +1,9 @@
+/*
+Original model from Event-B:
+L. Ladenberger, D. Hansen, H. Wiegard, J. Bendisposto, and M. Leuschel. Validation of the ABZ landing gear system using ProB. In Int. J. Softw. Tools Technol. Transf., 19(2):187–203, Apr. 2017.
+Translated to Classical B manually
+*/
MACHINE Ref5_Switch
SETS /* enumerated */
DOOR_STATE={open,closed,door_moving};
diff --git a/src/test/resources/de/hhu/stups/codegenerator/RelLaws_BOOL1.mch b/src/test/resources/de/hhu/stups/codegenerator/RelLaws_BOOL1.mch
index e578a57523c27d8ec740f98f789578f80bdc1217..3805d1aac23a310ea9f9b32de7a46409ba2006cb 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/RelLaws_BOOL1.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/RelLaws_BOOL1.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE RelLaws_BOOL1
// BOOL is BOOL
/* This machine is intended so that you can check whether ProB deals
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SeqLaws.mch b/src/test/resources/de/hhu/stups/codegenerator/SeqLaws.mch
index 90f4bde702b3eac779b44bf52ea40da4f897d955..b1edd4bd249144e3202526c000275f22063a9d4f 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SeqLaws.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SeqLaws.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SeqLaws
SETS
setY = {y1,y2}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLaws.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLaws.mch
index f22efe31bdafc55660269e83b070530d945faeeb..2f6d48c9d6d66191f6e75650387c4749ca548be5 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLaws.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLaws.mch
@@ -1,4 +1,7 @@
-
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLaws
SETS /* enumerated */
setX={el1,el2,el3}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsNat.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsNat.mch
index 0e6b7e92afc927c5ac9f3ce9027a47dfaed127fa..f06e7cbaffa97287dcbbcf48dc3e07f254a0b1ad 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsNat.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsNat.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsNat
VARIABLES
SS, TT, VV
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsNatural.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsNatural.mch
index e34107c16dabb0bf282ed223ac638be09fd33cd8..22a131133a6401d6908a19f7efd7c487026109c8 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsNatural.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsNatural.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsNatural
VARIABLES
SS, TT, VV
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow.mch
index 07f12a25d60e50728bacdc6729064987fbb49f66..fde22caa3f22f099f15387d532480d6c97c226f2 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow.mch
@@ -1,4 +1,7 @@
-
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsPow
SETS /* enumerated */
elements={el1}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow2.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow2.mch
index 0336934905a445505f0533446af5bb347b516ac7..48041f861d622b0a2064d1908e53861562c16551 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow2.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPow2.mch
@@ -1,4 +1,7 @@
-
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsPow2
SETS /* enumerated */
elements={el1,el2}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPow.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPow.mch
index 5fdde3a1bd26b0cb6c4ef5cee09a9f35c84acdfd..bbbd7ad206e7e3ade2e42bdf3e38011df9e34028 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPow.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPow.mch
@@ -1,4 +1,7 @@
-
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsPowPow
SETS /* enumerated */
elements={el1}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPowCart.mch b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPowCart.mch
index 82b5eda853f2b896092bb3d9eec30bc06b889bec..81e80769aabed429a428918ba4425a05c254b70f 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPowCart.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetLawsPowPowCart.mch
@@ -1,4 +1,7 @@
-
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetLawsPowPowCart
SETS /* enumerated */
elements={el1}
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetRelLaws_NatBool.mch b/src/test/resources/de/hhu/stups/codegenerator/SetRelLaws_NatBool.mch
index 7b1f003f0533cac98a4957174fadda3bb8319683..67e31e66d67c90e84dc2f68d673943e21e541e34 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetRelLaws_NatBool.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetRelLaws_NatBool.mch
@@ -1,3 +1,7 @@
+/*
+From ProB Examples, originally used to test ProB,
+rewritten for B2Program
+*/
MACHINE SetRelLaws_NatBool
/* SETS
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SetRelationConstructs.mch b/src/test/resources/de/hhu/stups/codegenerator/SetRelationConstructs.mch
index c82b411c51d806c0154f827406c8b6f9fa8edf66..2da5f835f371ba999532571990366250b54ba393 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SetRelationConstructs.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SetRelationConstructs.mch
@@ -1,3 +1,6 @@
+/*
+From ProB Examples, originally used to test ProB
+*/
MACHINE SetRelationConstructs
VARIABLES basea, a, baseb, b, basec, c
INVARIANT
diff --git a/src/test/resources/de/hhu/stups/codegenerator/Sieve.mch b/src/test/resources/de/hhu/stups/codegenerator/Sieve.mch
index d38d5da3cf4379f155cf577f8db1bde578c0fc42..e9e61da67e1b6090c007ccf1f0875a24733ee115 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/Sieve.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/Sieve.mch
@@ -1,3 +1,6 @@
+/*
+Written by Michael Leuschel
+*/
MACHINE Sieve
VARIABLES numbers,cur, limit
INVARIANT
diff --git a/src/test/resources/de/hhu/stups/codegenerator/SieveParallel.mch b/src/test/resources/de/hhu/stups/codegenerator/SieveParallel.mch
index 83c126dd7866836df1a9eefe23413adb7df51816..afb9e49b48eef9ebe577c9e712e3475d71109f31 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/SieveParallel.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/SieveParallel.mch
@@ -1,3 +1,6 @@
+/*
+Written by Michael Leuschel
+*/
MACHINE SieveParallel
VARIABLES numbers,cur, limit
INVARIANT
diff --git a/src/test/resources/de/hhu/stups/codegenerator/Simpson_Four_Slot.mch b/src/test/resources/de/hhu/stups/codegenerator/Simpson_Four_Slot.mch
index ea04239f94748a1d5c43037c8a18dc4259b9bf3e..9b98ace546d011f9e7fb025cd7af3c58ebf8324b 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/Simpson_Four_Slot.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/Simpson_Four_Slot.mch
@@ -1,3 +1,6 @@
+/*
+Model of Simpson's four slot algorithm
+*/
MACHINE Simpson_Four_Slot
SETS
INDEX = {p0,p1,s0,s1};
diff --git a/src/test/resources/de/hhu/stups/codegenerator/nota.mch b/src/test/resources/de/hhu/stups/codegenerator/nota.mch
index abd49c52f4e5f25ae8033d385e8ef444848f952b..49c9c47e0668dab14e5dd29c11238cf57815984b 100755
--- a/src/test/resources/de/hhu/stups/codegenerator/nota.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/nota.mch
@@ -1,3 +1,6 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+*/
MACHINE nota
/* these represent the classes */
diff --git a/src/test/resources/de/hhu/stups/codegenerator/nota_v2.mch b/src/test/resources/de/hhu/stups/codegenerator/nota_v2.mch
index 62b04c894ec187289c298f92c2828edf0ad21a2c..6d9a121751c39ec366061c6953c48d14d82cddd3 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/nota_v2.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/nota_v2.mch
@@ -1,3 +1,7 @@
+/*
+I. Oliver. Experiences in Using B and UML in Industrial Development. In Proceedings Formal Specification and Development in B, B’07, page 248–251, 2007.
+Simplified version for B2Program
+*/
MACHINE nota_v2
// a simplified version of nota for B2Program
diff --git a/src/test/resources/de/hhu/stups/codegenerator/prob_oneway8seq.mch b/src/test/resources/de/hhu/stups/codegenerator/prob_oneway8seq.mch
index 1e38e37cafba21d979201aa2ff2e1c50b17fd2e5..0de14d3d82535caaba557e5f870e12ec60dc1b28 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/prob_oneway8seq.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/prob_oneway8seq.mch
@@ -1,6 +1,8 @@
/* https://www3.hhu.de/stups/prob/index.php/Summary_of_B_Syntax */
/* Model from https://mars-workshop.org/repository/020-CBTC.html */
-
+/*
+F. Mazzanti and A. Ferrari. Ten diverse formal models for a cbtc automatic train supervision system. Electronic Proceedings in Theoretical Computer Science, 268:104–149, Mar. 2018.
+*/
MACHINE prob_oneway8seq
DEFINITIONS
diff --git a/src/test/resources/de/hhu/stups/codegenerator/scheduler.mch b/src/test/resources/de/hhu/stups/codegenerator/scheduler.mch
index 84f5f3593d45ef710782a59fd163b11c20a47765..dbf71c9a608f7c8325b37ba8837ce20e58d90ad6 100644
--- a/src/test/resources/de/hhu/stups/codegenerator/scheduler.mch
+++ b/src/test/resources/de/hhu/stups/codegenerator/scheduler.mch
@@ -1,3 +1,6 @@
+/*
+From ProB examples
+*/
MACHINE scheduler
SETS