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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     author = {V. E. Lopatkin},
     title = {The cohomology rings of asynchronous transition systems},
     journal = {Dalʹnevosto\v{c}nyj matemati\v{c}eskij \v{z}urnal},
     pages = {181--189},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DVMG_2011_11_2_a4/}
}
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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/