Voir la notice de l'article provenant de la source Czech Digital Mathematics Library
@article{ARM_1978__14_4_a5, author = {Krupka, Demeter}, title = {Elementary theory of differential invariants}, journal = {Archivum mathematicum}, pages = {207--214}, publisher = {mathdoc}, volume = {14}, number = {4}, year = {1978}, mrnumber = {512763}, zbl = {0428.58002}, language = {en}, url = {http://geodesic.mathdoc.fr/item/ARM_1978__14_4_a5/} }
Krupka, Demeter. Elementary theory of differential invariants. Archivum mathematicum, Tome 14 (1978) no. 4, pp. 207-214. http://geodesic.mathdoc.fr/item/ARM_1978__14_4_a5/