(3GhQGb GNQi ef GdQeGO hGdLeQ(B((3eJGHYGJ eUQjI hYQHjI (B1986 (3` (B1989) s - (3aGQhb YHOGdbGOQs ((3GdbGgQI (B: s (3eDSSI GdYQhHI ddWHGYI hGdfTQ ,s, 1990)
Keywords: (3GdGOH GdYQHis; (3GdYUQ GdMOjKs; (3JGQjN hfbOs