A note on Banach algebras that are not isomorphic to a group algebra. Barcenas, Diomedes, Espinoza, Walter, Rojas, Edixon (2008) Revista Colombiana de Matemáticas
Analytic sheaves in Banach spaces László Lempert, Imre Patyi (2007) Annales scientifiques de l'École Normale Supérieure