@article{SSS_1976-1977____A15_0,
     author = {Demazure, M.},
     title = {A, {B,} {C,} {D,} {E,} {F,} etc},
     journal = {S\'eminaire sur les singularit\'es des surfaces},
     note = {talk:13},
     pages = {1--6},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1976-1977},
     language = {fr},
     url = {http://www.numdam.org/item/SSS_1976-1977____A15_0/}
}