@article{IVM_1975_9_a4,
     author = {A. D. Ivanov},
     title = {Four-dimensional {Bol} webs of elliptic or hyperbolic type},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {25--34},
     publisher = {mathdoc},
     number = {9},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1975_9_a4/}
}