column
2000, 11(2): 119-125.
2000, 11(2): 126-132.
2000, 11(2): 153-158.
2000, 11(2): 199-202.
2000, 11(2): 208-214.
2000, 11(2): 215-220.
2000, 11(2): 221-226.