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@article{MZ_1952__57_169326, author = {Evan T. Davies}, title = {On the {Invariant} {Theory} of {Contact} {Transformations.}}, journal = {Mathematische Zeitschrift}, pages = {415--427}, publisher = {mathdoc}, volume = {57}, year = {1952}, zbl = {0050.16304}, url = {http://geodesic.mathdoc.fr/item/MZ_1952__57_169326/} }
Evan T. Davies. On the Invariant Theory of Contact Transformations.. Mathematische Zeitschrift, Tome 57 (1952), pp. 415-427. http://geodesic.mathdoc.fr/item/MZ_1952__57_169326/