Morse, Marston The index theorem in the calculus of variations. (English) Zbl 0019.12402 Duke Math. J. 4, 231-246 (1938). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 Documents Keywords:Variational calculus PDF BibTeX XML Cite \textit{M. Morse}, Duke Math. J. 4, 231--246 (1938; Zbl 0019.12402) Full Text: DOI