@article{RLIN_1992_9_3_2_a3,
     author = {Campanato, Sergio},
     title = {On the eigenvalues of an elliptic operator \( {a(x,H(u))} \)},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {107--110},
     publisher = {mathdoc},
     volume = {Ser. 9, 3},
     number = {2},
     year = {1992},
     zbl = {0784.35079},
     mrnumber = {1306303},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_1992_9_3_2_a3/}
}