@article{DM_2001_13_1_a6,
     author = {O. A. Emets and S. I. Nedobachii and L. N. Kolechkina},
     title = {An irreducible system of constraints of a combinatorial polyhedron in a linear-fractional optimization problem on permutations},
     journal = {Diskretnaya Matematika},
     pages = {110--118},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DM_2001_13_1_a6/}
}