@article{MZM_2001_70_2_a1,
     author = {Yu. S. Volkov},
     title = {Nonnegative {Solutions} to {Systems} with {Symmetric} {Circulant} {Matrix}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {170--180},
     publisher = {mathdoc},
     volume = {70},
     number = {2},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2001_70_2_a1/}
}