Borges Vieira, L. R. Theory of associated systems for study of the stability in the large. (English) Zbl 0137.28602 Bol. Soc. Mat. São Paulo 17 (1962), 1-117 (1965). PDFBibTeX XMLCite \textit{L. R. Borges Vieira}, Bol. Soc. Mat. São Paulo 17, 1--117 (1965; Zbl 0137.28602)
Borges Vieira, L. R. Theory of associated systems for study of the stability in the large. (English) Zbl 0112.06002 Bol. Soc. Mat. São Paulo 14, 13-81 (1962). PDFBibTeX XMLCite \textit{L. R. Borges Vieira}, Bol. Soc. Mat. São Paulo 14, 13--81 (1962; Zbl 0112.06002)