@article{RLIN_2000_9_11_1_a1,
     author = {Metafune, Giorgio and Pallara, Diego},
     title = {Discreteness of the spectrum for some differential operators with unbounded coefficients in \( {\mathbb{R}^{n}} \)},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {9--19},
     publisher = {mathdoc},
     volume = {Ser. 9, 11},
     number = {1},
     year = {2000},
     zbl = {0982.35078},
     mrnumber = {1343161},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_2000_9_11_1_a1/}
}