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E. Artin and J. T. Tate, A Note on finite ring extensions, J. Math. Soc. Japan vol. 3 (1951) pp. 74-77. MR 0044509 (13:427c)

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H. Cartan and S. Eilenberg, Homological algebra, Princeton, Princeton University Press, 1956. MR 0077480 (17:1040e)

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E. Golod, On the cohomology ring of a finite p-group, Dokl. Akad. Nauk SSSR vol. 125 (1959) pp. 703-706 (Russian). MR 0104720 (21:3473)

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G. P. Hochschild and J.-P. Serre, Cohomology of group extensions, Trans. Amer. Math. Soc. vol. 74 (1953) pp. 110-135. MR 0052438 (14:619b)

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A. J. Kostrikin and I. R. Šafarevič, Cohomology groups of nilpotent algebras, Dokl. Akad. Nauk SSSR vol. 115 (1957) pp. 1066-1069 (Russian). MR 0092776 (19:1156d)

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P. Samuel and O. Zariski, Commutative algebra, vol. II, Princeton, D. Van Nostrand, 1960. MR 0120249 (22:11006)

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N. E. Steenrod, Cohomology operations derived for the symmetric group, Comm. Math. Helv. vol. 31 (1956-1957) pp. 195-218. MR 0092147 (19:1069i)

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R. G. Swan, The nontriviality of the restriction map in cohomology of groups, Proc. Amer. Math. Soc. vol. 11 (1960) pp. 885-887. MR 0124050 (23:A1370)

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B. B. Venkov, Cohomology algebras for some classifying spaces, Dokl. Akad. Nauk SSSR vol. 127 (1959) pp. 943-944 (Russian). MR 0108788 (21:7500)