(3GdLQjeI hGdeLJeY (B/s - (3Tajb, eMeO eMeOs ((3GdEScfOQjI, eUQ (B:s (3GdecJH GdLGeYj GdMOjK,s, 1987)
(3edGMb (B: (3UaMI (B214-230.s
(3HHdjhLQGajI (B: (3UaMI (B203-211.s
Keywords: (3Yde GdGLJeGY GdLfGFj s -- (3ebGdGJ heMGVQGJ s; (3GdOaGY GdGLJeGYjs -- (3ebGdGJ heMGVQGJ s