@article{INTA_1965_a2,
     author = {M. A. Akivis},
     title = {Conformal differential geometry},
     journal = {Itogi Nauki i Tekhniki. Seriya Algebra. Geometriya. Topologiya },
     pages = {108--137},
     publisher = {mathdoc},
     year = {1965},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTA_1965_a2/}
}