(3LQjeI GNJdGS GdGehGd GdYGeI aj GdJTQjY hGdbVGA GdYQGbj (B: s (((3OQGSI ebGQfI(B)) / s - (3GdLhQGfj, YHO GdQMef, s ((3HZOGO (B[(3GdYQGb(B] : s (3eWHYI GdLGMX (B990s, 1990)
(3GUd GdcJGH QSGdI eGLSJjQ HJbOjQ LjO LOG(B.s
(3jJVef GQLGYGJ HHdjhLQGajI (B: (3UaMI (B368-391.s
Keywords: (3LQGFe GdGNJdGSs -- (3bhGfjf hJTQjYGJs -- (3GdYQGb(B.s; (3LQGFe GdGehGds -- (3bhGfjf hJTQjYGJs -- (3GdYQGb(B.s