@article{SJL_1969___3_15_0,
     author = {Pham, Fr\'ed\'eric},
     title = {Formules de {Picard-Lefschetz}},
     journal = {S\'eminaire Jean Leray},
     pages = {15--22},
     publisher = {Coll\`ege de France},
     number = {3},
     year = {1969},
     language = {fr},
     url = {http://www.numdam.org/item/SJL_1969___3_15_0/}
}