@article{ASNSP_1975_4_2_1_89_0,
     author = {Tromba, A. J.},
     title = {Euler-Poincar\'e index theory on {Banach} manifolds},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {89--106},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 2},
     number = {1},
     year = {1975},
     mrnumber = {385913},
     zbl = {0315.58006},
     language = {en},
     url = {http://archive.numdam.org/item/ASNSP_1975_4_2_1_89_0/}
}