(3HjY GdLOc ddeMdGJ GdJLGQjI h GdUfGYjg h GdefTBJ GdCNQi (B: s (3OQGSI abgjg bVGFjg (B/ s - (3bQg, aJMjgs ((3GdEScfOQjg (B:s (3efTCI GdeYGQa,s, 1987)
Keywords: (3GdbGfhf GdeOfjs; (3GdedcjIs