(3bQGQ hRjQ GdGbJUGO hGdJYGhf GdGbJUGOi Qbe (B(375 (3dSfI (B1977) :s (3HGUOGQ GddGFMI GdJfajPjI dbGfhf fXGe GSJKeGQ GdeGd GdYQHi hGdGLfHi hGdefGWb GdMQI (B/s - (3eUQ, GdgjFI GdYGeI ddGSJKeGQ hGdefGWb GdMQIs ([(3ecGf GdfTQ ZjQ eMOO(B] :s [(3GdfGTQ ZjQ eMOO(B](3,s, 1980)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdGSJKeGQs; (3GdeGdjI GdYGeI hGdJTQjY GdVQjHjs