(3UahI GdJaGSjQ (B: s (3JaSjQ GdbQBf GdcQje(B_ (3LGeY Hjf GdeCKhQ h Gdefbhd (B/ s - (3GdUGHhfj, eMeO Ydjs ((3HjQhJ (B:s (3OGQ GdbQBf GdcQje,s, 1981)
Keywords: (3GdbQBf GdcQjes; (3JaSjQs