@article{GDZPPN002290243, title = {Decomposition of Differential Equations.}, journal = {Mathematische Annalen}, volume = {146}, year = {1962}, pages = {263-278}, zbl = {0166.02802}, url = {http://dml.mathdoc.fr/item/GDZPPN002290243} }
CHEN, K.-T. Decomposition of Differential Equations.. Mathematische Annalen, Tome 146 (1962) pp. 263-278. http://gdmltest.u-ga.fr/item/GDZPPN002290243/