@article{DAN_1964_158_6_a1,
     author = {M. I. Gorbunova},
     title = {Horispheres in certain {Grassmann} manifolds},
     journal = {Doklady Akademii Nauk},
     pages = {1250--1253},
     publisher = {mathdoc},
     volume = {158},
     number = {6},
     year = {1964},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1964_158_6_a1/}
}