Geodesic
Hochschild cohomologies for $Z$-rings with a~power basis
Matematičeskie zametki, Tome 4 (1968) no. 2, pp. 141-150.

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Let $\Lambda$ be an associative ring with unity. The main result of the article consists in the proof of the periodicity of the Hochschild cohomologies of $\Lambda$ in the case when $\Lambda$ is a $Z$-ring with a power basis. The period is equal to 2. This result is proved for maximal orders of fields of algebraic numbers. 
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     author = {F. R. Bobovich and D. K. Faddeev},
     title = {Hochschild cohomologies for $Z$-rings with a~power basis},
     journal = {Matemati\v{c}eskie zametki},
     pages = {141--150},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a3/}
}
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F. R. Bobovich; D. K. Faddeev. Hochschild cohomologies for $Z$-rings with a~power basis. Matematičeskie zametki, Tome 4 (1968) no. 2, pp. 141-150. http://geodesic.mathdoc.fr/item/MZM_1968_4_2_a3/