(3TQM GdeTcd ef TYQ GdeJfHj (B/ s - (3Hf SjO , Ydj Hf GSeGYjd s ((3HZOGO (B: s (3OGQ GdTDhf GdKbGajI GdYGeI , s, 1990)
Keywords: (3GdTYQ GdYQHj s -- (3OhGhjf hbUGFO s