@article{INTG_1975_7_a15,
     author = {S. B. Kadomtsev},
     title = {A study of certain properties of normal torsion of a two-dimensional surface in four-dimensional space},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {267--278},
     publisher = {mathdoc},
     volume = {7},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1975_7_a15/}
}