1. Ceška, A. & H. Roemer. 1976: Ceška-Roemer Program for Identifying Species-Releve Groups. Manuscript. 14 pp.
2. Dale, M.B. & L. Quadraccia. 1973. Computer assisted tabular sorting of phytosociological data. Vegetatio 28: 57–73.
3. Holzner, W. & F. Stockinger. 1973. Der Einsatz von Elektronen-rechnern bei der pflanzensoziologischen Tabellenarbeit. Oesterr. Bot. Z. 121: 303–309.
4. Holzner, W., M.J.A. Werger & G.A. Ellenbroek. 1978. Automatic classification of phytosociological data on the basis of species groups. Vegetatio 38: 157–164.
5. Lieth, H. & G.W. Moore. 1971. Computerized clustering of species in phytosociological tables and its utilization for field work. In: G.P. Patil, E.C. Pielou & W.E. Waters (eds.), Statistical Ecology, Vol. 1, p. 403–422. London, Penn. State Univ. Press.