// <I>Procееdings<D> of the 8th International Scientific Conference Achievements in Mechanical and Materials Engineering , Gliwice -Rydzyna- Pawlowice-Rokosowo, 24-27 October 1999.- Gliwice : Silesian Univ., 1999, p. 619-622.
(1999)
D. V. Tsaneva; R. Shishkov; E. Lisichkova;
M. Balcheva и др.