Geodesic
Determination of minimal coloring of vertices of a graph by means of Boolean powers of the incidence matrix
Doklady Akademii Nauk, Tome 147 (1962) no. 4, pp. 758-759 
L. M. Vitaver. Determination of minimal coloring of vertices of a graph by means of Boolean powers of the incidence matrix. Doklady Akademii Nauk, Tome 147 (1962) no. 4, pp. 758-759. http://geodesic.mathdoc.fr/item/DAN_1962_147_4_a2/
@article{DAN_1962_147_4_a2,
     author = {L. M. Vitaver},
     title = {Determination of minimal coloring of vertices of a graph by means of {Boolean} powers of the incidence matrix},
     journal = {Doklady Akademii Nauk},
     pages = {758--759},
     year = {1962},
     volume = {147},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_147_4_a2/}
}
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