M. Huchard, A. Napoli, M. Hacene, und P. Valtchev. Selected Contributions in Data Analysis and Classification, Studies in Classification, Data Analysis, and Knowledge Organization, (Oktober 2007)
T. Hanika, F. Schneider, und G. Stumme. Accepted for publication in: Tohoku Mathematical Journal, (2020)cite arxiv:1801.07985Comment: v2: completely rewritten 28 pages, 3 figures, 2 tables.