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. 
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     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},
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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://archive.numdam.org/item/ASNSP_1974_4_1_3-4_301_0/

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