1. MacQuuen, J.B.: Some methods for classification and analysis of multivariate observation. In: Proceedings of the 5th Berkley Symposium on Mathematical Statistics and Probability, pp. 281–297 (1967)
2. Lance, G.N., Williams, W.T.: A general theory of classificatory sorting strategies. Comput. J.
3. Langfelder, P., Zhang, B., Horvath, S.: Defining clusters from a hierarchical cluster tree: the dynamic tree cut package for r. Bioinform. Appl. Note 24(5), 719–720 (2008)
4. Ahmad, A., Dey, L.: A k-mean clustering Algorithm for mixed numeric and categorical data. Data Knowl. Eng. 63(2), 503–527 (2007)
5. Apresjan, J.D.: An algorithm for constructing clusters from a distance matrix. Mashinnyi perevod: Prikladnaja lingvistika 9, 3–18 (1966)