(3JYdje GdCWaGd GdehghHjf (B/ s - (3MhGTjf, RjOGf fLjHs; (3MhGTjf, eajO fLjHs ((3YeGf (B:s (3OGQ GdacQ ddfTQ hGdJhRjY,s, 1989)
Keywords: (3GdWdGH GdehghHhfs; (3GdJYdje GdNGUs