(3JGQjN GQHd (B:s (3GdeSei fHGgI GdHdO GdNGed Hef hQOI GdGeGKd (B/s - (3GdOQHdj ,TQa GdOjf GHj GdHQcGJ GdeHGQc Hf GMeO GddNej s; (3GdUbGQ,SGej Hf GdSjO eNGS s ((3HZOGO(B:s (3hRGQI GdKbGaI GdGYdGe ,s, 1980)
Keywords: (3GdQLGd (B-(3JQGLe s