(3edGeM GdJjGQGJ GdSjGSjI aj GdbQf GdGhd GdgLQj (B/ s - (3HjVhf, GHQGgje, s ((3HjQhJ (B[(3dHfGf(B] : s (3OGQ GdfgVI GdYQHjI (B979.s, 1979)
(3jJVef cTGaGJ(B.s
(3jJVef GQLGYGJ HHdjhLQGajI (B: (3UaMI (B367-379.s
Keywords: (3GdJGQjN GdGSdGejs -- (3YUQ UOQ GdESdGe, (B610-661.s; (3GdNdaGA GdQGTOhf(B.s