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1Published 1958“...HD 1491 .E81 .C697...”
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2Published 1989“...HD 1920.7 .Z8 .C734...”
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3Published 1994“...HN 372 .T737...”
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4Published 1990“...HX 550 .R48 .W927...”
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5Published 1992“...HF 1557 .W927...”
Conference Proceeding Book