(3ceGd LfHdGW ai GdMbjbI hGdJGQjN(B: (3L(B3 / s - (3QGLi YTbhfis ([S.N] : (3dLfI GdGYdGe hGdOQGSGJ GdeSJbHdjI , s, 1989)
Keywords: (3GdGMhGd GdGLJeGYjIs; (3GdUQGY GdWGFais; (3dHfGf (B- (3JGQjN (B- (3GdYUQ GdMOjKs; (3GdMQH GdGgdjIs