(3bQGAI KGfjI aj GdHGQhOj (B/ s - (3GdWGdH , YeQ eMeO s ((3GdehUd (B: s (3OGQ GdcJH ddWHGYI hGdfTQ , s, 1981)
Keywords: (3GdTYQ GdYQHj s -- (3JGQjN hfbO s