// <I>Ttransport problems 2019<D> : 11th International conference, Katowice, Bochnia, Poland, 26-28.06. 2019 : Proc. - Silesian univ. of Technology, 2019, p. 505-515. - 1 диск ; 12 см
V. Pencheva; A. Tsekov; I. R. Georgiev;
P. Y. Stoyanov;
A. Asenov и др.