@article{DAN_1963_149_4_a1,
     author = {K. I. Dunichev},
     title = {Stratification of two-parameter families of straight lines in a higher-dimensional projective space},
     journal = {Doklady Akademii Nauk},
     pages = {763--764},
     publisher = {mathdoc},
     volume = {149},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1963_149_4_a1/}
}