@misc{ASCFM_1982__71_20_P3_0, title = {Introduction}, journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques}, pages = {3--3}, publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont}, volume = {71}, number = {20}, year = {1982}, language = {fr}, url = {http://archive.numdam.org/item/ASCFM_1982__71_20_P3_0/} }