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- [8] ADJOINT OF AN ELLIPTIC LINEAR-DIFFERENTIAL OPERATOR AND ITS POTENTIAL THEORY ARKIV FOR MATEMATIK, 1973, 11 (02): : 153 - 165
- [10] M-BROWDER-ACCRETIVENESS OF A QUASI LINEAR-DIFFERENTIAL OPERATOR HOUSTON JOURNAL OF MATHEMATICS, 1984, 10 (01): : 147 - 152