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1Published 1959“...QC 989 .G83 .B411 1959...”
Conference Proceeding Book -
2Published 1966“...QC 994.9 .E96 1966...”
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6
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7by Stelling, C. (Cornelis)“...QC 879.59 .A6 .S824 1970...”
Published 1970
Conference Proceeding Book