@article{1183494169, author = {Grove, V. G.}, title = {On canonical forms of differential equations}, journal = {Bull. Amer. Math. Soc.}, volume = {36}, number = {11}, year = {1930}, pages = { 582-586}, language = {en}, url = {http://dml.mathdoc.fr/item/1183494169} }
Grove, V. G. On canonical forms of differential equations. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 582-586. http://gdmltest.u-ga.fr/item/1183494169/