(3GdQGHhWjGJ (B/ s - (3deHQJ, eGQcs; (3YQaGJ, YHO Gdedcs ((3HjQhJ (B:s (3GdeDSSI GdYQHjI ddOQGSGJJ,s, 1987)
Keywords: (3GdCfSGf GdBdj GdUfGYjs; (3GdQHhWjIs; (3fGTFhf cHGQ (B(15-18 (3SfI(B)s