// <I>SFITES' 2015<D> : Scientific forum on "Innovative trends in engineering and science' 2015", Kavala, Greece, 29-30 May 2015 : Proc. - Ruse, 2015, p. 59-62.
D. Miteva; D. Grozev; V. Pencheva;
A. Asenov и др.
// <I>SERBIATRIB 2019<D> : 16th International conference of ''Tribology - SERBIATRIB ’19'', Kragujevac, Serbia, 15-17 may 2019 : Proc. on Engineering sciences. - Kragujevac, 2019, p. 197-207, DOI:10.24874/PES01-01-026.
M. Kandeva; T. Penyashki; G. Kostadinov;
M. Nikolova;
T. Grozdanova и др.