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- [2] EIGEN-FUNCTIONS OF ELLIPTIC OPERATOR IN CERTAIN UNBOUNDED REGIONS DOKLADY AKADEMII NAUK SSSR, 1965, 161 (04): : 757 - +
- [3] A PROPERTY OF LAPLACE-BELTRAMI OPERATOR EIGEN-FUNCTIONS CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES, 1989, 32 (02): : 129 - 139
- [5] THE SUMMABILITY OF SELF-ADJOINT OPERATOR EXPANSIONS IN EIGEN-FUNCTIONS DOKLADY AKADEMII NAUK SSSR, 1987, 292 (01): : 20 - 25
- [6] THE SUMMABILITY OF SCHRODINGER OPERATOR SPECTRAL EXPANSIONS IN EIGEN-FUNCTIONS BY RIESZ MEAN DOKLADY AKADEMII NAUK SSSR, 1986, 288 (03): : 563 - 566
- [8] EXPANSION IN EIGEN-FUNCTIONS OF A NON-SELFADJOINED DIFFERENTIAL OPERATOR OF ARBITRARY EVEN ORDER ON THE (O,INFINITY) HALF-AXIS DOKLADY AKADEMII NAUK SSSR, 1960, 132 (04): : 777 - 780
- [9] EXPANSION IN EIGEN-FUNCTIONS OF A SECOND-ORDER DIFFERENTIONAL EQUATION WITH OPERATOR COEFFICIENTS DOKLADY AKADEMII NAUK SSSR, 1969, 184 (04): : 774 - &
- [10] Absolute Convergence of Orthogonal Expansion in Eigen-Functions of Odd Order Differential Operator AZERBAIJAN JOURNAL OF MATHEMATICS, 2018, 8 (02): : 152 - 162