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- [2] EXTREMUM PROBLEMS IN THEORY OF POLYNOMIAL OPERATORS (NON-PERIODIC CASE) DOKLADY AKADEMII NAUK SSSR, 1961, 140 (03): : 519 - &
- [3] EXTREMUM PROBLEMS IN THEORY OF POLYNOMIAL OPERATIONS DOKLADY AKADEMII NAUK SSSR, 1966, 170 (01): : 13 - &
- [6] Existence Criteria in Some Extremum Problems Involving Eigenvalues of Elliptic Operators JOURNAL OF SIBERIAN FEDERAL UNIVERSITY-MATHEMATICS & PHYSICS, 2016, 9 (01): : 37 - 47
- [9] SOLVING AN EXTREMUM PROBLEM OF THE THEORY OF OPERATORS DOKLADY AKADEMII NAUK SSSR, 1982, 265 (04): : 777 - 781