@article{SMJ2_2018_44_1-2_a6,
     author = {Gutev, Valentin},
     title = {Constructing selections stepwise over skeletons of nerves of covers},
     journal = {Serdica Mathematical Journal},
     pages = {137--154},
     publisher = {mathdoc},
     volume = {44},
     number = {1-2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_2018_44_1-2_a6/}
}