Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1990_48_1_a13, author = {I. Z. Pesenson}, title = {Functions which are smooth along vector fields}, journal = {Matemati\v{c}eskie zametki}, pages = {95--102}, publisher = {mathdoc}, volume = {48}, number = {1}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a13/} }
I. Z. Pesenson. Functions which are smooth along vector fields. Matematičeskie zametki, Tome 48 (1990) no. 1, pp. 95-102. http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a13/