Rule Networks: A Style of Programming and an Expert System Toolkit. - Kostadin D. Kratchanov; Ivan N. Stanev; Y. Stereva; V. Vuleva-Mineva (AIMSA, 1988)

A fuzzy computational model implementation. - Kostadin D. Kratchanov; Ivan N. Stanev; Desislava S. Sabotinova (Kybernetika, 1992)