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@article{MAN_1962__148_161000, author = {H.H. JOHNSON}, title = {Classical {Differential} {Invariants} and {Applications} to {Partial} {Differential} {Equations.}}, journal = {Mathematische Annalen}, pages = {308--329}, publisher = {mathdoc}, volume = {148}, year = {1962}, zbl = {0171.06301}, url = {http://geodesic.mathdoc.fr/item/MAN_1962__148_161000/} }
H.H. JOHNSON. Classical Differential Invariants and Applications to Partial Differential Equations.. Mathematische Annalen, Tome 148 (1962), pp. 308-329. http://geodesic.mathdoc.fr/item/MAN_1962__148_161000/