(3GdSdGeI GdegfjI aj GdfTGW GdUfGYj GdeaGgje hGdJWHjbGJ (B/ s - (3LhGO, YHO GdMSjf eMeO, s; (3GdJejej, WGgQ LGSe, s ((3HZOGO (B[(3GdYQGb(B]: s (3eWHYI GdYeGd GdeQcRjI (B989.s, 1989)
(3jJVef edGMb(B.s
(3jJVef GQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdYQGb(B. (3hRGQI GdUfGYI hGdeYGOf(B. (3gjFI GdHMK hGdJWhjQ GdUfGYjs -- (3GOGQI(B.s; (3GdehbY GdUfGYj(B.s