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1Published 1986“...HB 141 .E192...”
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2Published 1986“...HB 141 .E192...”
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3Published 1989“...HC 670 .I5 .S6787...”
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4Published 1990“...HD 5850.4 .A6 .L1249...”
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5Published 1992“...HB 3692.5 .A3 .P8315...”
Conference Proceeding Book