@article{107012, author = {Demeter Krupka}, title = {Elementary theory of differential invariants}, journal = {Archivum Mathematicum}, volume = {014}, year = {1978}, pages = {207-214}, zbl = {0428.58002}, mrnumber = {512763}, language = {en}, url = {http://dml.mathdoc.fr/item/107012} }
Krupka, Demeter. Elementary theory of differential invariants. Archivum Mathematicum, Tome 014 (1978) pp. 207-214. http://gdmltest.u-ga.fr/item/107012/
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