added content to methods

Latex/references.bib

@@ -113,3 +113,38 @@ pages="371--383",
 abstract="In this paper, we propose several integer programming approaches with a polynomial number of constraints to formulate and solve the minimum connected dominating set problem. Further, we consider both the power dominating set problem -- a special dominating set problem for sensor placement in power systems -- and its connected version. We propose formulations and algorithms to solve these integer programs, and report results for several power system graphs.",
 isbn="978-3-642-31770-5"
 }
+@article{mtz_orig,
+author = {Miller, C. E. and Tucker, A. W. and Zemlin, R. A.},
+title = {Integer Programming Formulation of Traveling Salesman Problems},
+year = {1960},
+issue_date = {Oct. 1960},
+publisher = {Association for Computing Machinery},
+address = {New York, NY, USA},
+volume = {7},
+number = {4},
+issn = {0004-5411},
+url = {https://doi.org/10.1145/321043.321046},
+doi = {10.1145/321043.321046},
+journal = {J. ACM},
+month = oct,
+pages = {326–329},
+numpages = {4}
+}
+@article{mtz_improv,
+author = {Desrochers, Martin and Laporte, Gilbert},
+title = {Improvements and Extensions to the Miller-Tucker-Zemlin Subtour Elimination Constraints},
+year = {1991},
+issue_date = {February, 1991},
+publisher = {Elsevier Science Publishers B. V.},
+address = {NLD},
+volume = {10},
+number = {1},
+issn = {0167-6377},
+url = {https://doi.org/10.1016/0167-6377(91)90083-2},
+doi = {10.1016/0167-6377(91)90083-2},
+journal = {Oper. Res. Lett.},
+month = feb,
+pages = {27–36},
+numpages = {10},
+keywords = {subtour elimination constraints, vehicle routing problem, facets, lifting, traveling salesman problem}
+}