@article{INTA_1965_a1,
     author = {V. V. Ryzhkov},
     title = {Differential geometry of point transformations between spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya },
     pages = {65--107},
     publisher = {mathdoc},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1965_a1/}
}