Roger, Frederic Sur une classification des extremales. (French) Zbl 0020.30802 C. R. Acad. Sci., Paris 208, 705-708 (1939). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:Variational calculus PDF BibTeX XML Cite \textit{F. Roger}, C. R. Acad. Sci., Paris 208, 705--708 (1939; Zbl 0020.30802) OpenURL