(3GdMQjGJ GdUMajI aj GdhWf GdYQHj (B/s - (3GdCejf GdYGe dGJMGO GdUMajf GdYQH s ([(3Ohf ecGf(B] :s (3GdGJMGO GdYGe ddUMajjf GdYQH ,s, 1981)
Keywords: (3GdYQHjs; (3GdhWfs; (3GdMQjGJ s; (3GdUMajIs