(3GdeLJeY hGdOhdI aj GdNdjL hGdLRjQI GdYQHjI (B:s (3ef efXhQ eNJda(B\s - (3GdfbjH, NdOhf MSf s ((3HjQhJ (B: s (3eQcR OQGSGJ GdhMOI GdYQHjI ,s, 1989)
Keywords: (3GdeLJeY hGdOhdI s -- (3GdLRjQI GdYQHjI s