(3JGQjN GdYQGb GdGbJUGOj aj GdbQf (B4 (3GdgLQj(B:s - (3GdOhQj , YHO GdYRjRs ((3HjQhJ(B:s (3eQcR OQGSGJ GdhMOI GdYQHjI,s, 1999)
Keywords: (3GdYQGb (B-(3JGQjNs