(3GdehShYI GdLZQGajI ddYGde GdESdGei (B:s (3EaQjbjG GdESdGejI(B.s (3GdeLdO GdChd (B/s - (3YfGjGJ GdWMGhis ((3GdbGgQI (B:s (3GdeLdS GdCYdi ddTFhf GdGSdGejIs, 1970)
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. 255-258 (3HHdjhLQGajG(B: (3UaMGJ(B.s
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Keywords: (3GdehShYGJ hOhGFQ GdeYGQas