@article{PSMIR_1991___S6_186_0, author = {Blanchard-Laville, Claudine}, title = {Pr\'esentation}, journal = {Publications de l'Institut de recherche math\'ematiques de Rennes}, pages = {186--186}, publisher = {D\'epartement de Math\'ematiques et Informatique, Universit\'e de Rennes}, number = {S6}, year = {1991}, language = {fr}, url = {http://www.numdam.org/item/PSMIR_1991___S6_186_0/} }