+ref Schubert about elbow bad

references.bib

@@ -105,3 +105,17 @@ language = "English",
 booktitle = "IPCC Special Report Global Warming of 1.5 ºC",
 publisher = "Intergovernmental Panel on Climate Change"
 }
+
+@article{Schubert2023,
+   title={Stop using the elbow criterion for k-means and how to choose the number of clusters instead},
+   volume={25},
+   ISSN={1931-0153},
+   url={http://dx.doi.org/10.1145/3606274.3606278},
+   DOI={10.1145/3606274.3606278},
+   number={1},
+   journal={ACM SIGKDD Explorations Newsletter},
+   publisher={Association for Computing Machinery (ACM)},
+   author={Schubert, Erich},
+   year={2023},
+   month=jun, pages={36–42}
+}
\ No newline at end of file