@article{SM_1975_25_3_a4,
     author = {V. N. Sachkov},
     title = {On extremal points of the space of symmetric stochastic matrices},
     journal = {Sbornik. Mathematics},
     pages = {419--428},
     publisher = {mathdoc},
     volume = {25},
     number = {3},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_25_3_a4/}
}