共 50 条
- [1] OSCILLATION OF EVEN ORDER SELF-ADJOINT DIFFERENTIAL OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (03): : A327 - A327
- [2] DISCRETENESS OF SPECTRUM OF SELF-ADJOINT, EVEN ORDER, ONE-TERM, DIFFERENTIAL OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (07): : A658 - A658
- [10] OSCILLATION OF SELF-ADJOINT, FOURTH ORDER, LINEAR-DIFFERENTIAL OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1974, 21 (01): : A7 - A7