(3Ydi OQL GdejGg GdYejbI (B: s (3TYQ (B/ s - (3hSGW, eHGQcs ((3GdOGQ GdHjVGA (B:s (3OGQ JhHbGd ddfTQ,s, 1990)
Keywords: (3GdCOH GdYQHjs; (3GdTYQ GdYQHjs