(3GdCeI GdYQHjI (B:s (3aj eYQcI JMbjb GdPGJ (B/s - (3eMeO eHGQcs ((3OeTb (B:s (3efThQGJ eDSSI GdeWHhYGJ GdYQHjI (B,s, 1959)
. 240-220 (3HHdjhLQGajG(B: (3UaMGJ(B.s
Keywords: (3GdbhejI GdYQHjIs; (3GdbhejI s; (3GdGeI GdYQHjI s