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- [42] MULTIPLICITY OF SPECTRUM OF A SECOND ORDER DIFFERENTIAL OPERATOR DOKLADY AKADEMII NAUK SSSR, 1962, 145 (03): : 510 - &
- [43] SPECTRUM OF A SECOND ORDER PARTIAL DIFFERENTIAL OPERATOR CANADIAN MATHEMATICAL BULLETIN, 1969, 12 (05): : 688 - &
- [44] On Regularized Trace of a Differential Operator of Second Order 9TH INTERNATIONAL PHYSICS CONFERENCE OF THE BALKAN PHYSICAL UNION (BPU-9), 2016, 1722
- [48] SECOND-ORDER MATRIX DIFFERENTIAL OPERATOR PROCEEDINGS OF THE INDIAN ACADEMY OF SCIENCES SECTION A, 1974, 79 (05): : 213 - 222
- [49] NONLINEAR DIFFERENTIAL EQUATION OF SECOND ORDER COMPTES RENDUS HEBDOMADAIRES DES SEANCES DE L ACADEMIE DES SCIENCES SERIE A, 1971, 273 (25): : 1236 - &