Guitart, René Charles Ehresmann, a crossroad of local and algebraic structures. (Charles Ehresmann, au carrefour des structures locales et algébriques.) (French) Zbl 1074.18501 Cah. Topol. Géom. Différ. Catég. 46, No. 3, 172-175 (2005). Cited in 1 Document MSC: 18-03 History of category theory 01A60 History of mathematics in the 20th century PDFBibTeX XMLCite \textit{R. Guitart}, Cah. Topol. Géom. Différ. Catég. 46, No. 3, 172--175 (2005; Zbl 1074.18501)