(3JfGSN GdCLSGO (B: s (3bUI ESJfSGN cGFf HTQj (B/ s - (3QhQajc, OGajOs; (3LeHfLjGf, OjcQGfs ((3OeTb (B:s (3OGQ GdMceI ddWHGYI h GdfTQ,s, 1991)
Keywords: (3GdhQGKIs; (3GdgfOSI GdhQGKjIs; (3ESJfSGN GdEfSGfs