Geodesic
The genus of $G$-spaces and topological lower bounds for chromatic numbers of hypergraphs
Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 4, pp. 33-48

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Lower bounds for chromatic numbers of hypergraphs via genus and cohomological index of special complexes ($\operatorname{Hom}$- and $\operatorname{JHom}$-complexes) are given. 
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     author = {A. Yu. Volovikov},
     title = {The genus of $G$-spaces and topological lower bounds for chromatic numbers of hypergraphs},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
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     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2005_11_4_a2/}
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A. Yu. Volovikov. The genus of $G$-spaces and topological lower bounds for chromatic numbers of hypergraphs. Fundamentalʹnaâ i prikladnaâ matematika, Tome 11 (2005) no. 4, pp. 33-48. http://geodesic.mathdoc.fr/item/FPM_2005_11_4_a2/