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Brief Versions
Kolodner, I. I., Kaul, R. N., Schaefer, Paul, Brand, Louis, Blass, A. R., Stanojevic, C. V., Christilles, W. E., Bouwsma, W. D., Kleiman, Howard, Rao, B. L. S. Prakasa, London, Hymie, Wilde, A. C., BlVolume:
75
Journal:
The American Mathematical Monthly
DOI:
10.1080/00029890.1968.11970946
Date:
January, 1968
File:
PDF, 820 KB
1968