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1989(3):161-164.
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1989(3):164-167.
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1989(3):167-172.
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1989(3):173-176.
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1989(3):176-179.
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1989(3):179-182.
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1989(3):182-185.
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1989(3):185-188.
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1989(3):188-191.
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1989(3):191-194.
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1989(3):195-198.
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1989(3):199-201.
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1989(3):202-204.
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1989(3):204-207.
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1989(3):208-211.
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1989(3):212-215.
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1989(3):215-216.
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1989(3):217-219.
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1989(3):221-225.
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1989(3):222-221.
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1989(3):225-227.
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1989(3):227-232.
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1989(3):233-235.
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