Zhelyazkova, I., & Stefanova, S.
(2001).
A Presentator-Evaluater for Modeling Animation Knowledge, Based on Didactic Petri Nets. // <I>SAER' 01<D>: Procееdings of the 15 th International Conference "Systems for Automation of Engineering and Research", Varna, 21-23 September, 2001.- Sofia : House of the Union of Scientists of Bulgaria, 2001, p. 215-219.31..