(3bGfhf GSJKeGQ GdeGd GdYQHi hGdCLfHi hGdefGWb GdMQI (B/s - (3eUQ, eLdS GdTYHs ([(3ecGf GdfTQ ZjQ eMOO(B] :s [(3GdfGTQ ZjQ eMOO(B](3,s, 1974)
(3GdfU ehGmR HGddZJjf GdYQHjI hGdEfLdjRjIs
Keywords: (3GdGSJKeGQs; (3GdeGdjI GdYGeI hGdJTQjY GdVQjHjs