@article{DAN_1958_121_5_a9,
     author = {M. V. Pentkovsky},
     title = {Small projective transformations of nomograms},
     journal = {Doklady Akademii Nauk},
     pages = {805--806},
     year = {1958},
     volume = {121},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1958_121_5_a9/}
}