column
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1991, 12(4): 336-342.
1991, 12(4): 337-341.
1991, 12(4): 343-348.
1991, 12(4): 349-354.
1991, 12(4): 355-359.
1991, 12(4): 360-386.
1991, 12(4): 361-366.
1991, 12(4): 393-398.
1991, 12(4): 399-405.
1991, 12(4): 407-412.
1991, 12(4): 413-417.