Rashkova, T.,
Antonov, A., &
Rashkov, P.
(2001).
Basic Constructions in the Theory of P.I. Algebras Realized by Mathematica. // <I>[Third]<D> 3rd International Workshop on Mathematica System in Teaching and Research, Siedlce, 5-7 September 2001.- Siedlce : Univ. of Podlasie [ Institute of Mathematics and Physics, Wydawnictwo Akademii Podlaskiej], 2001, p. 145-154..