@article{AIF_1987__37_2_105_0,
     author = {Xu, Chao-Jiang},
     title = {R\'egularit\'e des solutions d'\'equations aux d\'eriv\'ees partielles non lin\'eaires associ\'ees \`a un syst\`eme de champs de vecteurs},
     journal = {Annales de l'Institut Fourier},
     pages = {105--113},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {37},
     number = {2},
     year = {1987},
     doi = {10.5802/aif.1088},
     zbl = {0609.35023},
     mrnumber = {88i:35033},
     language = {fr},
     url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1088/}
}