Krastev, K., & Marinov, E.
().
Comparative investigation of D-1000 engine having aluminium and composite piston. // <I>MOTAUTO' 02 <D> : Proc., Ruse, 29-31 oktober 2002. : Vol. 1. Internal combustion engines. - Sofia : Scientific-technical union of mechanical engineering of Bulgaria, 2002, p. 108-110..