(3fSYi Edi eSJbHd (B: s (3OjhGf TYQ ddCWaGd (B/ s - (3YeQh, LeGds; (3bWH, eMeOs ((3GdbGgQI (B:s (3GdgjFI GdeUQjI GdYGeI ddcJGH,s, 1990)
Keywords: (3GdTYQ GdYQHjs; (3COH GdCWaGds; (3eUQs; (3fGTFhf UZGQ (B(10-14)s