(3GdehLR aj JGQjN GdQSe GdMOjK (B/ s - (3QjO, gQHQJs; (3GdHcQj, deYGfs ((3HZOGO (B:s (3OGQ GdTDhf GdKbGajI GdYGeI,s, 1989)
Keywords: (3GdQSes; (3GdJGQjNs