共 11 条
- [1] BIRIUK G, 1964, J MATH MECH, V13, P617
- [2] COMMUTANTS OF ORDINARY DIFFERENTIAL-OPERATORS [J]. JOURNAL OF DIFFERENTIAL EQUATIONS, 1980, 35 (03) : 339 - 365
- [3] FORMALLY NORMAL OPERATORS HAVING NO NORMAL EXTENSIONS [J]. CANADIAN JOURNAL OF MATHEMATICS, 1965, 17 (06): : 1030 - +
- [8] PETRYSHYN WV, 1967, PHILOS T ROY SOC L A, V262, P413
- [9] Schafke F. W., 1965, MATH ANN, V162, P9
- [10] S-HERMITIC EIGENVALUE BOUNDARY PROBLEMS .3. [J]. MATHEMATISCHE ANNALEN, 1968, 177 (01) : 67 - &