Weyl formula for quasi-elliptic pseudo-differential operators
Rendiconti del Seminario Matematico della Università di Padova, Tome 105 (2001), pp. 215-231. 
@article{RSMUP_2001__105__215_0,
     author = {Nicola, F.},
     title = {Weyl formula for quasi-elliptic pseudo-differential operators},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {215--231},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {105},
     year = {2001},
     mrnumber = {1834992},
     zbl = {1072.58018},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_2001__105__215_0/}
}
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Nicola, F. Weyl formula for quasi-elliptic pseudo-differential operators. Rendiconti del Seminario Matematico della Università di Padova, Tome 105 (2001), pp. 215-231. http://archive.numdam.org/item/RSMUP_2001__105__215_0/

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