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MR 0237687 |
Zbl 0191.01601
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MR 0237688 |
Zbl 0191.01602
[3] HEAD T. J.:
Homomorphisms of commutative semigroups as tensor maps. J. Natur. Sci. and Math. 7, 1967, 39-49.
MR 0230828 |
Zbl 0167.02101