(3GdQheGf (B/ s - (3SgjQ GdbdeGhis; (3HGQh, Q(B.(3g`s; (3YHOGdQGRb jSQis ((3GdbGgQI (B: s (3GdgjFI GdYGeI ddcJH hGdGLgRI GdYdejI , s, 1968)
Keywords: (3GHGWQI GdQheGfs; (3GjWGdjGs; (3GdQhes