(3YKdjG (B: s (3eGSGI (B/ s - (3jhSa eMeO QVGs; (3QGSjf, LGfs ((3HjQhJ (B: s (3OGQ GdcJGH GddHfGfi , s, 1971)
Keywords: (3GdGOH GdaQfSis; (3GdeSQMjI GdaQfSjIs; (3GdGOH GdaQfSi GdeJQLes