@article{ASNSP_1982_4_9_2_175_0,
     author = {Godin, Paul},
     title = {Hypoelliptic and {Gevrey} hypoelliptic invariant differential operators on certain symmetric spaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {175--209},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 9},
     number = {2},
     year = {1982},
     mrnumber = {674972},
     zbl = {0517.35023},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1982_4_9_2_175_0/}
}