@article{GDZPPN002094495, title = {Normalization of Differential Equations Defining a CR Structure.}, journal = {Inventiones mathematicae}, volume = {46}, year = {1978}, pages = {33-60}, zbl = {0389.32006}, url = {http://dml.mathdoc.fr/item/GDZPPN002094495} }
Luk, Hing-Sun. Normalization of Differential Equations Defining a CR Structure.. Inventiones mathematicae, Tome 46 (1978) pp. 33-60. http://gdmltest.u-ga.fr/item/GDZPPN002094495/