@article{ASCFM_1974__51_9_P3_0,
     author = {Hennequin, P. L.},
     title = {Avant-propos},
     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 = {51},
     number = {9},
     year = {1974},
     language = {fr},
     url = {http://archive.numdam.org/item/ASCFM_1974__51_9_P3_0/}
}