(3GdbGfhf GdLhj (B:s (3Gdfbd GdLhj (B/s - (3GdYQjfj, eMeO aQjO(B.s ((3HjQhJ (B:s (3GdOGQ GdLGeYjI ddfTQ hGdJhRjY,s, 1980)
Keywords: (3GdbGfhf GdLhjs; (3Gdfbd GdLhjs -- (3bhGfjf hJTQjYGJs