(3GdWbS h GdefGN (B: s (3OQGSI aj WHjYI GdLh h LZQGajI GdefGN (B/ s - (3CHh GdYWG, agej gdGdj gdGdjs ((3GdEScfOQjg (B:s (3OGQ GdeYQaI GdLGeYjI,s, 1987)
Keywords: (3GdWbSs; (3GdefGNs