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- [1] ASYMPTOTIC PROPERTIES OF VARIATIONAL EIGENVALUES FOR SEMILINEAR ELLIPTIC-OPERATORS BOLLETTINO DELLA UNIONE MATEMATICA ITALIANA, 1988, 2B (02): : 411 - 425
- [2] ASYMPTOTICS OF EIGENVALUES FOR ONE CLASS OF NONUNIFORMLY ELLIPTIC-OPERATORS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1991, (11): : 94 - 96
- [3] THE ASYMPTOTICS OF EIGENVALUES FOR ONE CLASS OF ELLIPTIC-OPERATORS WORKING IN THE FIBERINGS WITH EDGE DOKLADY AKADEMII NAUK SSSR, 1982, 263 (03): : 530 - 531
- [4] ON A CLASS OF SINGULAR ELLIPTIC-OPERATORS BOLLETTINO DELLA UNIONE MATEMATICA ITALIANA, 1986, 5B (03): : 829 - 849
- [7] ESSENTIAL SPECTRA OF A CLASS OF ELLIPTIC-OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1988, 38 : 286 - 292
- [8] OSCILLATION OF ELLIPTIC-OPERATORS AND THE STRUCTURE OF THEIR SPECTRUM DOKLADY AKADEMII NAUK SSSR, 1984, 279 (02): : 306 - 309