Tompkins, C. Classification of curves on a two-dimensional manifold under a restricted set of continuous deformations. (English) JFM 65.0458.01 Ann. Math., Princeton, (2) 40, 384-391 (1939). Reviewer: Skolem, Th., Prof. (V. Aker bei Oslo) PDF BibTeX XML Cite \textit{C. Tompkins}, Ann. Math. (2) 40, 384--391 (1939; JFM 65.0458.01) Full Text: DOI OpenURL
Morse, M. Functional topology and abstract variational theory. (English) JFM 65.0457.05 Mém. Sci. math. 92, 78 S. (1939). Reviewer: Radon, J., Prof. (Breslau) PDF BibTeX XML Full Text: EuDML OpenURL
Morse, M. Sur le calcul des variations. (French) JFM 65.0457.04 Ann. Inst. Henri Poincaré 9, 1-11 (1939). Reviewer: Radon, J., Prof. (Breslau) PDF BibTeX XML Cite \textit{M. Morse}, Ann. Inst. Henri Poincaré 9, 1--11 (1939; JFM 65.0457.04) Full Text: Numdam EuDML OpenURL