@article{ASNSP_2003_5_2_2_345_0,
     author = {Montanari, Annamaria},
     title = {H\"older a priori estimates for second order tangential operators on {CR} manifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {345--378},
     publisher = {Scuola normale superiore},
     volume = {Ser. 5, 2},
     number = {2},
     year = {2003},
     mrnumber = {2005607},
     zbl = {1170.35433},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_2003_5_2_2_345_0/}
}