@article{ASCFM_1977__65_15_P5_0,
     author = {Hennequin, P. L.},
     title = {Introduction},
     journal = {Annales scientifiques de l'Universit\'e de Clermont. Math\'ematiques},
     pages = {5--6},
     publisher = {UER de Sciences exactes et naturelles de l'Universit\'e de Clermont},
     volume = {65},
     number = {15},
     year = {1977},
     language = {fr},
     url = {http://www.numdam.org/item/ASCFM_1977__65_15_P5_0/}
}