Stoyanov, S.,
Dobreva, A., &
Dobrev, V.
().
Upgrading of a theoretical model of a belt track system. // <I>Trans & Motauto' 06<D> : 13th intern. sci.-techn. conf., Varna, 25-28 oktober 2006 : Proc. - Sofia : Sci. -techn. union of mech. engineering of Bulgaria, 2006, р. 11-16..