@article{GDZPPN002324296, title = {Analytic Foliations and the Theory of Levels.}, journal = {Mathematische Annalen}, volume = {264}, year = {1983}, pages = {253-262}, zbl = {0507.57014}, url = {http://dml.mathdoc.fr/item/GDZPPN002324296} }
Cantwell, John; Conlon, Lawrence. Analytic Foliations and the Theory of Levels.. Mathematische Annalen, Tome 264 (1983) pp. 253-262. http://gdmltest.u-ga.fr/item/GDZPPN002324296/