共 6 条
- [1] ARONSZAJN N, 1957, J MATH PURE APPL, V36, P235
- [2] Bolza Oscar., 1909, VORLESUNGEN VARIATIO
- [3] Hartman P., 1955, PROC, V6, P862
- [4] KREITH K, 1963, P AM MATH SOC, V14, P33
- [5] Leighton W., 1962, P AM MATH SOC, V13, P603
- [6] SCHWARZ AH, 1890, GESAMMELTE MATHEMATI, V1