column
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1989, 10(4): 271-275.
1989, 10(4): 277-284.
1989, 10(4): 303-308.
1989, 10(4): 309-317.
1989, 10(4): 333-339.
1989, 10(4): 340-340.
1989, 10(4): 341-347.
1989, 10(4): 348-362.
1989, 10(4): 349-354.
1989, 10(4): 355-361.