@article{DAN_1962_146_3_a1,
     author = {M. A. Akivis},
     title = {On a class of tangentially degenerate surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {515--518},
     publisher = {mathdoc},
     volume = {146},
     number = {3},
     year = {1962},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1962_146_3_a1/}
}