(3GdMjGI GdGLJeGYjI ai eUQ GdbOjeI (B/ s - (3HJQi h(B.(3e adfOQRs; (3MSf eMeO LhgQ (B((3eJQLe(B)s; (3YHOGdefYe YHOGdMcjes ([S.N] : (3GdgjFI GdeUQjI GdYGeI ddcJGH , s, 1975)
Keywords: (3eUQs; (3JGQjNs; (3GdGMhGd GdGLJeGYjIs; (3eUQ GdbOjeIs; (3GdMVGQI GdaQYhfjIs