Geodesic
On the space of essential infinitesimal deformations of a manifold over the algebra of $k$-plural numbers
Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 23 (1997), pp. 7-21 
A. V. Boyarshinova. On the space of essential infinitesimal deformations of a manifold over the algebra of $k$-plural numbers. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 23 (1997), pp. 7-21. http://geodesic.mathdoc.fr/item/KUTGS_1997_23_a1/
@article{KUTGS_1997_23_a1,
     author = {A. V. Boyarshinova},
     title = {On the space of essential infinitesimal deformations of a manifold over the algebra of $k$-plural numbers},
     journal = {Trudy Geometricheskogo Seminara},
     pages = {7--21},
     year = {1997},
     volume = {23},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUTGS_1997_23_a1/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

We demonstrate that the space of essential infinitesimal deformations of the structure of manifold over algebra of $k$-plural numbers is isomorphic to the first cohomology gioup of manifold with coefficients in the sheaf of holomorphic vector fields.