(3eOGQ GdUMQGA (B: s (3OQGSI aj COH YHO GdQMef efja (B/ s - (3GdfGHdSj, TGcQs ((3HjQhJ (B:s (3GdeDSSI GdYQHjI ddOQGSGJ h GdfTQ,s, 1991)
Keywords: (3GdbUU GdYQHjIs; (3GdJGQjN GdCOHjs; (3GdfbO GdCOHjs; (3GdYQGbs