(3EjbGX GdgeI dWdH Yde GdcJGH hGdSfI (B/s - (3GdSYjOGf, YGOd Hf YHO Gddgs ((3GdQjGV (B- (3GdSYhOjI(B:s (3eDSSI GdLQjSj,s, 1989)
Keywords: (3GdESdGe hGdYdhes; (3BOGH WGdH GdYdes