21 (3OhdI dGeI YQHjI hGMOI (B/ s - (3Ndjd GMeO Ndjds; (3fhOjfh(B, (3LGf aQGfShGs; (3cGed GdMGLs ([S.N] : (3HjSGf ddfTQ hGdJhRjY , s, 1993)
Keywords: (3GdbhejI GdYQHjIs; (3eLdS GdJYGhf dOhd GdNdjL GdYQHs; (3efXeIHdOGf GdYQHjIGdeUOQIddfaWs; (3GJMGO GdeZQH GdYQHis; (3GdYGde GdYQHi (B- (3GdGMhGd GdSjGSjIs