Bliss, G. A. Normality and abnormality in the calculus of variations. (English) JFM 64.0510.01 Trans. Amer. math. Soc. 43, 365-376 (1938). Reviewer: Radon, J., Prof. (Breslau) × Cite Format Result Cite Review PDF Full Text: DOI
Hestenes, M. R. Sufficient conditions for the problem of Bolza in the calculus of variations. (English) JFM 60.0458.01 Transactions A. M. S. 36, 793-818 (1934). Reviewer: Radon, J., Prof. (Breslau) × Cite Format Result Cite Review PDF Full Text: DOI
Hestenes, M. R. Sufficient conditions for the general problem of Mayer with variable end points. (English) JFM 59.0499.01 Transactions A. M. S. 35, 479-490 (1933). Reviewer: Hammerstein, A., Prof. (Kiel) × Cite Format Result Cite Review PDF Full Text: DOI