hal-00693044 title_s Non-linear factorization of linear operators auteur W. B. Johnson, Bernard Maurey, G. Schechtman journal Bulletin of the London Mathematical Society volume 41 pages 663--668 doi 10.1112/blms/bdp040 fichier_autre https://api.istex.fr/ark:/67375/HXZ-TB1M45DM-0/fulltext.pdf?sid=hal origine_autre istex annee 2009