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- [3] EXISTENCE OF CONJUGATE POINTS FOR SELF-ADJOINT DIFFERENTIAL EQUATIONS OF EVEN ORDER NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (07): : A725 - A725
- [8] OSCILLATION OF EVEN ORDER SELF-ADJOINT DIFFERENTIAL OPERATORS NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1973, 20 (03): : A327 - A327
- [9] SINGULAR DIFFERENTIAL EQUATIONS .2. SOME SELF-ADJOINT EVEN ORDER CASES QUARTERLY JOURNAL OF MATHEMATICS, 1967, 18 (69): : 13 - &