Geodesic
On the existence of positive solutions of systems of linear equations
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 3 
Yu. I. Merzlyakov. On the existence of positive solutions of systems of linear equations. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 3. http://geodesic.mathdoc.fr/item/RM_1963_18_3_a9/
@article{RM_1963_18_3_a9,
     author = {Yu. I. Merzlyakov},
     title = {On the existence of positive solutions of systems of linear equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1963},
     volume = {18},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_3_a9/}
}
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