@article{IVM_1999_1_a6,
     author = {M. Prvanovich},
     title = {Extended recurrent manifolds},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {41--50},
     year = {1999},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1999_1_a6/}
}