@article{JMAG_2001_8_a3,
     author = {S. I. Okrut},
     title = {The {Riemannian} manifolds with an axiom of hyperspheres},
     journal = {\v{Z}urnal matemati\v{c}eskoj fiziki, analiza, geometrii},
     pages = {392--418},
     publisher = {mathdoc},
     volume = {8},
     year = {2001},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JMAG_2001_8_a3/}
}