column
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1992, 13(2): 100-108.
1992, 13(2): 109-115.
1992, 13(2): 117-121.
1992, 13(2): 132-138.
1992, 13(2): 139-144.
1992, 13(2): 145-151.
1992, 13(2): 153-159.
1992, 13(2): 161-164.
1992, 13(2): 165-171.
1992, 13(2): 173-176.
1992, 13(2): 177-184.