KUZMA, Bojan, 2010, Bendaoud, M.; Bourhim, A.; Burgos, M.; Sarih, M.: Linear maps preserving Fredholm and Atkinson elements of C [sup] [ast]-algebras. (English). - [J] Linear Multilinear Algebra 57, No. 8, 823-838 (2009). ISSN 0308-1087; ISSN 1563-5139. [online]. 2010. [Accessed 5 April 2025]. Retrieved from: http://www.zentralblatt-math.org/zmath/en/advanced/?q=an:1185.47035