1. CHEMLAB. Molecular Design Ltd. 1986. CHEM-X. Chemical Design Ltd. 1986. MacroModel. Columbia University 1986
2. Dugundji J, Ugi I (1973) Top Cur Chem 39:19
3. Dugundji J, Gillespie P, Marquarding D, Ugi I, Ramirez F (1976) Metric spaces and graphs representing the logical structure of chemistry. In: Balaban AT (ed) Chemical applications of graph theory. Academic Press, New York, p 107
4. Kratochvíl M (1981) Chem Listy 75:675
5. Kratochvíl M (1983) Chem Listy 77:225