Celebratio Mathematica

article J.-P. Bour­guignon: “En­tre­tien avec un op­tim­iste, S. S. Chern” [In­ter­view with an op­tim­ist, S. S. Chern], Gaz. Math. 48 (1991), pp. 5–​10. An Eng­lish trans­la­tion was pub­lished in S. S. Chern: A great geo­met­er of the twen­ti­eth cen­tury (1992). MR 1116889

incollection J.-P. Bour­guignon: “Shi­ing Shen Chern, an op­tim­ist,” pp. 261–​267 in S. S. Chern: A great geo­met­er of the twen­ti­eth cen­tury. Edi­ted by S.-T. Yau. Mono­graphs in geo­metry and to­po­logy. In­ter­na­tion­al Press (Hong Kong), 1992. Eng­lish trans­la­tion pub­lished in Gaz. Math. 48 (1991). MR 1201366