(3LQGFe GdJNda hGdZjGH hGdgQhH aj GdJTQjY GdYScQj GdYQGbj (B:s (3OQGSI ebGQfI (B/s - (3SdeGf, MceJ ehSis ((3HZOGO (B:s (3OGQ GdTDhf GdKbGajI GdYGeI,s, 1987)
(3HHdjhLQGajI (B: (3U(B. 251-263.s
Keywords: (3GdbGfhf GdYScQjs -- (3GdYQGbs; (3GdeMGce GdYScQjIs -- (3GdYQGbs