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@Nasdaq Sun, N., Yu, H.: A method to determine the number of clusters based on multi-validity index. In: Nguyen, H.S., Ha, Q.-T., Li, T., Przybyła-Kasperek, M. (eds.) IJCRS 2018. LNCS (LNAI), vol. 11103, pp. 427–439. Springer, Cham (2018). https://t.co/mX