@article{ASNSP_1997_4_24_3_511_0,
     author = {Boggiatto, P. and Buzano, E.},
     title = {Spectral asymptotics for multi-quasi-elliptic operators in $\mathbb {R}^n$},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {511--536},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 24},
     number = {3},
     year = {1997},
     mrnumber = {1612397},
     zbl = {0897.35056},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1997_4_24_3_511_0/}
}