@article{IVM_1996_7_a0,
     author = {A. V. Aminova and S. A. Zorin},
     title = {Geodesic structure of four-dimensional {P.} {A.} {Shirokov} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--17},
     year = {1996},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1996_7_a0/}
}