@article{105138, author = {Old\v rich Kowalski}, title = {The invariant classification of 3-dimensional linear subspaces of infinitesimal isometries of $E\_3$}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {008}, year = {1967}, pages = {635-649}, zbl = {0163.43003}, mrnumber = {0228629}, language = {en}, url = {http://dml.mathdoc.fr/item/105138} }
Kowalski, Oldřich. The invariant classification of 3-dimensional linear subspaces of infinitesimal isometries of $E_3$. Commentationes Mathematicae Universitatis Carolinae, Tome 008 (1967) pp. 635-649. http://gdmltest.u-ga.fr/item/105138/
Differential geometry and symmetric spaces, 1962, Academic Press, New York and London. | MR 0145455 | Zbl 0122.39901
Vorlesungen über die Integration der partiellen Differentialgleichungen erster Ordnung, (Teubner 1893).