(3bUI GdScc GdMOjOjg (B/ s - (3HhhO, QjJTGQOs; (3Rcj, CMeOs ((3HjQhJ (B:s (3ecJHI dHfGf,s, 1980)
Keywords: (3GdScc GdMOjOjgs; (3fGTFhf cHGQ (B( 15 - 18 (3SfI (B)s