(3Qbe (B(23) (3dSfI (B1971 (3bGfhf CUhd GdeMGceGJ GdLRGFjI (B/s - (3hRGQI GdYOds ((3dG jhLO ecGf ddfTQ (B:s (3OGQ GdMQjI ddWHGYI (B- (3eWHYI GdMcheI,s, 1971)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdbGfhf GdLfGFjs; (3bGfhf GdELQGAGJ GdLfGFjIs -- (3bhGfjf hJTQjYGJs; (3bGfhf CUhd GdeMGceGJ GdLRGFjIs