Young, L. C. Generalized surfaces in the calculus of variations. (English) Zbl 0063.09081 Ann. Math. (2) 43, 84-103 (1942). Not reviewed Cited in 31 Documents PDF BibTeX XML Cite \textit{L. C. Young}, Ann. Math. (2) 43, 84--103 (1942; Zbl 0063.09081) Full Text: DOI