Finite-dimensional Banach spaces with numerical index zero. Miguel Martín, Javier Merí, Angel Rodríguez-Palacios (2004) Extracta Mathematicae
Fixed points of holomorphic mappings for domains in Banach spaces. Harris, Lawrence A. (2003) Abstract and Applied Analysis
Full Operators on Reflexive Banach Space S. Karanasios (1994) Δελτίο της Ελληνικής Μαθηματικής Εταιρίας