no. 3-4

A degree for a class of acyclic-valued vector fields in Banach spaces
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 3-4, pp. 301-310. 
@article{ASNSP_1974_4_1_3-4_301_0,
     author = {Furi, M. and Martelli, M.},
     title = {A degree for a class of acyclic-valued vector fields in Banach spaces},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {301--310},
     publisher = {Scuola normale superiore},
     volume = {Ser. 4, 1},
     number = {3-4},
     year = {1974},
     mrnumber = {380874},
     zbl = {0306.55009},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1974_4_1_3-4_301_0/}
}
Furi, M.; Martelli, M. A degree for a class of acyclic-valued vector fields in Banach spaces. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 4, Tome 1 (1974) no. 3-4, pp. 301-310. http://www.numdam.org/item/ASNSP_1974_4_1_3-4_301_0/

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