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Research supported by a grant from NSERC (Canada).
Research supported by NSF (USA) under grants MCS 79-00907 and MCS 83-01065.
Studies and research supported by an NSF (USA) graduate fellowship. Some of the research reported here appears also in this author's recent Ph.D. Thesis [5].
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Lakser, H., Taylor, W. & Tschantz, S.T. A new proof of Gumm's theorem. Algebra Universalis 20, 115–122 (1985). https://doi.org/10.1007/BF01236810
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DOI: https://doi.org/10.1007/BF01236810