column
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1998, 19(2): 97-106.
1998, 19(2): 125-130.
1998, 19(2): 137-142.
1998, 19(2): 143-147.
1998, 19(2): 148-152.
1998, 19(2): 153-159.
1998, 19(2): 160-164.