(3GdbVGA GdCOGQi(B.s (3GdcJGH GdKGdK(B,s "(3bVGA GdJCOjH(B" (3OQGSI ebGQfI (B/s - (3SdjeGf eMeO GdWeGhis ((3GdbGgQI (B:s (3OGQ GdacQ GdYQHj(B,s, 1987)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdSdWGJ GdJGOjHjI s; (3GdbGfhf GdEOGQis