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- [4] ON THE BESSEL PROPERTY OF THE SYSTEMS OF EIGENFUNCTIONS OF DIFFERENTIAL-OPERATORS DOKLADY AKADEMII NAUK SSSR, 1991, 318 (01): : 16 - 20
- [5] ON THE NUMBER OF NODAL DOMAINS FOR EIGENFUNCTIONS OF ELLIPTIC DIFFERENTIAL-OPERATORS JOURNAL OF THE LONDON MATHEMATICAL SOCIETY-SECOND SERIES, 1985, 31 (FEB): : 91 - 100
- [7] COMPLETENESS OF EIGENFUNCTIONS OF QUADRATIC BEAMS OF ORDINARY DIFFERENTIAL-OPERATORS IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII MATEMATIKA, 1992, (03): : 35 - 44