(3JGQjN GQHcs (3GdeSei fHGgI GdHdO GdNGed Hef hQOg ef GeKGds - (3GdGQHdj , TQa GdOjf Hf HQcGJs; (3GdUbGQ , SGej Hf GdSjO NeGS(B.s ((3HZOGO (B[(3GdYQGb(B]:s (3OGQ GdQTjO ddfTQ,s, 1980)
Keywords: (3GdYQGbs -- (3GQHjds -- (3JGQjNs