Greenspan, D. On approximating extremals of functionals. II: Theory and generalizations related to boundary value problems for nonlinear differential equations. (English) Zbl 0171.13704 Int. J. Eng. Sci. 5, 571-588 (1967). PDFBibTeX XMLCite \textit{D. Greenspan}, Int. J. Eng. Sci. 5, 571--588 (1967; Zbl 0171.13704) Full Text: DOI
Fleming, W. H. Nondegenerate surfaces of finite topological type. (English) Zbl 0087.27201 Trans. Am. Math. Soc. 90, 323-335 (1959). PDFBibTeX XMLCite \textit{W. H. Fleming}, Trans. Am. Math. Soc. 90, 323--335 (1959; Zbl 0087.27201) Full Text: DOI
Fleming, W. H.; Young, L. C. A generalized notion of boundary. (English) Zbl 0058.04602 Trans. Am. Math. Soc. 76, 457-484 (1954). PDFBibTeX XMLCite \textit{W. H. Fleming} and \textit{L. C. Young}, Trans. Am. Math. Soc. 76, 457--484 (1954; Zbl 0058.04602) Full Text: DOI
Young, L. C. On the compactness and closure of surfaces of finite area, continuous or otherwise, and on generalized surfaces. (English) Zbl 0051.29501 Rend. Circ. Mat. Palermo, II. Ser. 2, 106-118 (1953). PDFBibTeX XMLCite \textit{L. C. Young}, Rend. Circ. Mat. Palermo (2) 2, 106--118 (1953; Zbl 0051.29501) Full Text: DOI
Young, Laurent Chisholm Surfaces paramétriques généralisées. (French) Zbl 0044.10203 Bull. Soc. Math. Fr. 79, 59-84 (1951). PDFBibTeX XMLCite \textit{L. C. Young}, Bull. Soc. Math. Fr. 79, 59--84 (1951; Zbl 0044.10203) Full Text: DOI Numdam EuDML