(3hLGA eGjh (B: s (3OQGSI ddcaGM GdhWfj GdShOGfj (B/ s - (3GdYbGO, YGeQs ((3HjQhJ (B:s (3OGQ GdLjd,s, 1972)
Keywords: (3JGQjN GdShOGfs; (3GdJGQjN GdMOjKs