Geodesic
On~the Hopf algebra of~a~local ring
Izvestiya. Mathematics , Tome 8 (1974) no. 2, pp. 259-284.

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The Hopf algebra $\operatorname{Tor}^A(k, k)$, where $A$ is a local ring and $k$ its residue class field, is studied by means of the Eilenberg–Moore spectral sequence converging to it and to a quotient algebra. It is shown that the Poincaré series of $A$ depends only on the homology structure of its Koszul complex as an algebra with Massey operations. 
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L. L. Avramov. On~the Hopf algebra of~a~local ring. Izvestiya. Mathematics , Tome 8 (1974) no. 2, pp. 259-284. http://geodesic.mathdoc.fr/item/IM2_1974_8_2_a0/

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