@article{IVM_1990_9_a12,
     author = {G. V. Davydov and I. M. Davydova},
     title = {Solvability of the system $Ax=0$, $x\ge0$, with indeterminate coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {85--88},
     publisher = {mathdoc},
     number = {9},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1990_9_a12/}
}