@article{SJL_1972-1973___3_1_0,
     author = {Leray, Jean},
     title = {Compl\'ement \`a la th\'eorie {d'Arnold} de l'indice de {Maslov}},
     journal = {S\'eminaire sur les \'equations aux d\'eriv\'ees partielles},
     pages = {1--17},
     year = {1972-1973},
     publisher = {Coll\`ege de France},
     number = {3},
     language = {fr},
     url = {https://www.numdam.org/item/SJL_1972-1973___3_1_0/}
}