(3YQhV GdehTMGJ GdCfOdSjI (B: s (3OQGSI h JWHjb (B/ s - (3QMje, ebOGOs ((3HZOGO (B:s (3OGQ GdTDhf GdKbGajI GdYGeI,s, 1990)
Keywords: (3GdTYQ GdCfOdSjs