Quarante-cinq ans et cent numéros des Publications mathématiques de l'I.H.É.S. - Quelques souvenirs . On the conductor formula of Bloch . Smooth quasiregular mappings with branching . Indecomposable parabolic bundles and the Existence of Matrices in Prescribed Conjugacy Class Closures with Product Equal to the Identity . Vertex algebras and the formal loop space . Publications mathématiques de l'IHÉS