(3GdagQSI GdehVhYjI (B: s (3OQGSI aj QDhS GdehVhYGJ hbhGFegG (B/ s - (3YHO GdgGOj, eMeO aJMjs ((3GdbGgQI (B: s (3OGQ ZQjH, s, 1990)
Keywords: (3GdagQSI GdehVhYjI(B. s; (3QDhS GdehVhYGJ(B. s; (3GdagQSI(B. s