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- [4] THE NECESSARY CONDITIONS OF BASICITY OF A SYSTEM OF EIGEN AND ADJOINT FUNCTIONS OF THE 2ND-ORDER DIFFERENTIAL OPERATOR IN L2(G) DOKLADY AKADEMII NAUK SSSR, 1988, 299 (04): : 809 - 811
- [7] ACCURATE ESTIMATIONS FOR EIGEN FUNCTIONS AND ASSOCIATED FUNCTIONS OF A 2ND-ORDER ELLIPTIC OPERATOR DOKLADY AKADEMII NAUK SSSR, 1984, 279 (06): : 1314 - 1318