(3HhdjhcJ (B: s (3eGSGI (B/ s - (3chQfi (B, (3HjjQs; (3jhSa eMeO QVGs ((3HjQhJ (B: s (3OGQ GdcJGH GddHfGfi , s, 1970)
Keywords: (3GdGOH GdaQfSis; (3GdeSQMjI GdaQfSjIs; (3GdGOH GdaQfSi GdeJQLes