Cohomology in abstract unit groups
-  E. Artin and J. Tate, Algebraic functions and algebraic numbers, Lecture notes at Princeton University, vol. 2, to be published.
-  A. H. Clifford and Saunders Mac Lane, Factor-sets of a group in its abstract unit group, Trans. Amer. Math. Soc. 50 (1941), 385–406. MR 0005722, https://doi.org/10.1090/S0002-9947-1941-0005722-X
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