(3GdfXGe GdOSJhQi GdeUQi (B:s (3OSJhQ SfI (B1971 /s - (3SYO YUahQ(B.s ((3efTCI GdeYGQa (B:s (3GdGScfOQjI(B,s, 1980)
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdbGfhf GdOSJhQi(B.s