A first part of a systematic presentation of Pfaffian geometry is given.
@article{urn:eudml:doc:44199, title = {Stratifications adapted to finite families of differential 1-forms (Pfaffian geometry - Part one).}, journal = {Revista Matem\'atica de la Universidad Complutense de Madrid}, volume = {8}, year = {1995}, pages = {269-292}, zbl = {0862.32002}, mrnumber = {MR1367931}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:44199} }
Cabello, A. B.; Hajto, Z. Stratifications adapted to finite families of differential 1-forms (Pfaffian geometry - Part one).. Revista Matemática de la Universidad Complutense de Madrid, Tome 8 (1995) pp. 269-292. http://gdmltest.u-ga.fr/item/urn:eudml:doc:44199/