(3GdehLR aj WH GdeLJeY (B/ s - (3HGQc, O(B. (3L(B. (3C(B.s; (3Gdghfj, GdRQhb eUHGMs; (3GdMVjQj, SGdes ((3WQGHdS (B((3djHjG(B) :s (3eLeY GdaGJM ddLGeYGJ,s, 1989)
Keywords: (3GdUMI GdYGeIs