(3GdYGde aj GdbQf GdYTQjf (B:s (3YUQ GdMQhH GdYGdejI h GdKhQGJ (B/s - (3HQGhQ, OGfjjd s ([(3Ohf ecGf(B] :s (3eQcR GdcJH GdGQOfj ,s, 1990)
Keywords: (3GdYGdes; (3GdbQf GdYTQjf s; (3MQhH s; (3YUQs