Geodesic
The cohomology rings of asynchronous transition systems
Dalʹnevostočnyj matematičeskij žurnal, Tome 11 (2011) no. 2, pp. 181-189.

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In this paper we introduce the cohomology rings of asynchronous transition systems. We'll show that different asynchronous transition systems which have isomorphic homology groups may have nonisomorphic cohomology rings. 
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V. E. Lopatkin. The cohomology rings of asynchronous transition systems. Dalʹnevostočnyj matematičeskij žurnal, Tome 11 (2011) no. 2, pp. 181-189. http://geodesic.mathdoc.fr/item/DVMG_2011_11_2_a4/

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