Fréchet, Maurice Sur une définition intrinseque de l’aire d’une surface courbe comme limite d’aires polyedrales inscrites. (French) Zbl 0021.42601 Ann. Sc. Norm. Super. Pisa, II. Ser. 8, 285-300 (1939). PDFBibTeX XMLCite \textit{M. Fréchet}, Ann. Sc. Norm. Super. Pisa, II. Ser. 8, 285--300 (1939; Zbl 0021.42601) Full Text: Numdam EuDML
Michal, Aristotle D.; Hyers, Donald H. Theory and applications of abstract normal coordinates in a general differential geometry. (English) Zbl 0018.36701 Ann. Sc. Norm. Super. Pisa, II. Ser. 7, 157-175 (1938). PDFBibTeX XMLCite \textit{A. D. Michal} and \textit{D. H. Hyers}, Ann. Sc. Norm. Super. Pisa, II. Ser. 7, 157--175 (1938; Zbl 0018.36701) Full Text: Numdam EuDML
Michal, A. D.; Hyers, D. H. Theory and applications of abstract normal coordinates in a general differential geometry. (English) JFM 64.1369.01 Ann. Scuola norm. sup. Pisa (2) 7, 157-175 (1938). Reviewer: Conforto, F., Prof. (Rom) PDFBibTeX XMLCite \textit{A. D. Michal} and \textit{D. H. Hyers}, Ann. Sc. Norm. Super. Pisa, II. Ser. 7, 157--175 (1938; JFM 64.1369.01) Full Text: EuDML