(3bUGFO ef CQV GdHWhdGJ (B: s (3TYQ (B/ s - (3GdYGeQj, YGeQ eMeO SdjeGfs ((3eSbW (B:s (3hRGQI GdJQGK Gdbhej h GdKbGaI,s, 1980)
Keywords: (3GdTYQ GdYQHjs; (3GdYUQ GdMOjKs; (3YeGfs