column
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1990, 11(3): 173-177.
1990, 11(3): 179-184.
1990, 11(3): 185-191.
1990, 11(3): 193-198.
1990, 11(3): 203-208.
1990, 11(3): 209-214.
1990, 11(3): 223-227.
1990, 11(3): 228-248.
1990, 11(3): 237-242.
1990, 11(3): 249-252.
1990, 11(3): 253-257.
1990, 11(3): 258-258.
1990, 11(3): 259-263.