(3GdUeJ (B: s (3eRQYI GdXfhf (B/ s - (3GdSHjYi (B: (3jYbhHs ([(3GdchjJ(B] : s (3eDSSI GdQjGVi ddWHGYI GdYGeI (B: s, 1989)
Keywords: (3GdSHjYi (B: (3jYbhHs; (3GdTYQ GdYQHis