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3Published 1997“...QC 803 .A6 .R585...”
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13by Stelling, C. (Cornelis)“...QC 879.59 .A6 .S824 1970...”
Published 1970
Conference Proceeding Book -
14Published 1961“...QC 830 .R8 .S425...”
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15Published 1972“...QC 879.73 .A55 .N691...”
Conference Proceeding Book