Update article reference in docs landing page

Author: nunofachada

docs/docs/index.md

@@ -48,8 +48,10 @@ scatter3(o.points(:, 1), o.points(:, 2), o.points(:, 3), 36, o.clusters, 'filled
 The *clugen* algorithm and its several implementations are detailed in the
 following reference (please cite it if you use this software):
 
-* Fachada, N. & de Andrade, D. (2023). Generating Multidimensional Clusters With
-  Support Lines. <https://doi.org/10.48550/arXiv.2301.10327>.
+* Fachada, N. & de Andrade, D. (2023). Generating multidimensional clusters
+  with support lines. *Knowledge-Based Systems*, 277, 110836.
+  <https://doi.org/10.1016/j.knosys.2023.110836>
+  ([arXiv preprint](https://doi.org/10.48550/arXiv.2301.10327))
 
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