Geodesic
On the geometry of point mappings of four-dimensional Euclidean spaces
Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 5 (1974), pp. 345-358.

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Correspondences between two Euclidean 4-spaces of the type $(2,2)$ (Melzi [8]) are studied. The canonical frame is constructed; the theorem of existence of correspondences having special properties is proved. 
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     author = {V. I. Romanov},
     title = {On the geometry of point mappings of four-dimensional {Euclidean} spaces},
     journal = {Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara},
     pages = {345--358},
     publisher = {mathdoc},
     volume = {5},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTG_1974_5_a14/}
}
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V. I. Romanov. On the geometry of point mappings of four-dimensional Euclidean spaces. Itogi Nauki i Tekhniki. Seriya Problemy Geometrii. Trudy Geometricheskogo Seminara, Trudy Geometricheskogo Seminara, Tome 5 (1974), pp. 345-358. http://geodesic.mathdoc.fr/item/INTG_1974_5_a14/