Ehresmann, C. Catégories structurées d’opérateurs. (French) Zbl 0217.06901 C. R. Acad. Sci., Paris 256, 2080-2083 (1963). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 4 Documents MSC: 18D99 Categorical structures PDFBibTeX XMLCite \textit{C. Ehresmann}, C. R. Acad. Sci., Paris 256, 2080--2083 (1963; Zbl 0217.06901)