(3OehY GdYPGQi (B/ s - (3QhaGjd, HjGQs ((3HjQhJ (B: s (3OGQ GdLjd , s, 1990)
Keywords: (3GdGOH GdaQfSi GdeJQLes; (3GdbUU GdaQfSjI GdeJQLeIs