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- [3] ESSENTIAL SPECTRUM OF SECOND-ORDER DEGENERATE ELLIPTIC OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1974, 8 (AUG): : 463 - 482
- [6] Stability of the essential spectrum of second-order complex elliptic operators JOURNAL FUR DIE REINE UND ANGEWANDTE MATHEMATIK, 1998, 500 : 113 - 126
- [8] On the Robin Problem for Second-Order Elliptic Equations in Cylindrical Domains Mathematical Notes, 2018, 103 : 430 - 446