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1989(4)
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1989(4):322-324.
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1989(4):325-332.
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1989(4):241-244.
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1989(4):245-249.
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1989(4):249-254.
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1989(4):254-257.
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1989(4):258-262.
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1989(4):262-265.
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1989(4):265-268.
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1989(4):269-272.
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1989(4):272-276.
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1989(4):276-279.
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1989(4):279-282.
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1989(4):283-290.
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1989(4):290-293.
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1989(4):293-296.
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1989(4):296-299.
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1989(4):300-303.
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1989(4):303-306.
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1989(4):307-310.
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1989(4):311-317.
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1989(4):317-319.
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1989(4):319-321.
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