Geodesic
On a generalization of perfect $b$-matching
Mathematica Bohemica, Tome 116 (1991) no. 4, pp. 380-384.

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The paper is concerned with the existence of non-negative or positive solutions to $Af=\beta$, where $A$ is the vertex-edge incidence matrix of an undirected graph. The paper gives necessary and sufficient conditions for the existence of such a solution.
DOI : 10.21136/MB.1991.126032
Classification : 05C50, 68E10, 68R10
Keywords: perfect $b$-matching; beta-non-negative and beta-positive graphs; systems of linear equations 
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Šándorová, Ľubica; Trenkler, Marián. On a generalization of perfect $b$-matching. Mathematica Bohemica, Tome 116 (1991) no. 4, pp. 380-384. doi : 10.21136/MB.1991.126032. http://geodesic.mathdoc.fr/articles/10.21136/MB.1991.126032/

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