(3QSGFd GdYOd h GdJhMjO (B/ s - (3GdHUQj, MSfs; (3YeGQg, eMeOs ((3HjQhJ (B:s (3OGQ GdTQhb,s, 1988)
Keywords: (3GdJhMjOs; (3Yde GdcdGes