### Bibliography

#### Works connected to ~~Isaac Jacob Schoenberg~~

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On separation, comparison and oscillation theorems for self-adjoint systems of linear second order differential equations,” Amer. J. Math. 53 : 4 (October 1931), pp. 781–800. MR 1506854 JFM 57.0528.01 Zbl 0003.25702

: “On the derivation of necessary conditions for the problem of Bolza,” Bull. Amer. Math. Soc. 38 : 12 (1932), pp. 858–864. MR 1562533 JFM 58.0535.01 Zbl 0006.25902

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