@article{DAN_1961_137_1_a1,
     author = {Yu. L. Vasil'ev},
     title = {Comparison of the complexity of impasse d.n.f. and minimal d.n.f.},
     journal = {Doklady Akademii Nauk},
     pages = {13--16},
     publisher = {mathdoc},
     volume = {137},
     number = {1},
     year = {1961},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1961_137_1_a1/}
}