Approximate Cauchy-Jensen type mappings in quasi-\(\beta\)-normed spaces. (English) Zbl 1311.39032
Rassias, Themistocles M. (ed.), Handbook of functional equations. Stability theory. New York, NY: Springer (ISBN 978-1-4939-1285-8/hbk; 978-1-4939-1286-5/ebook). Springer Optimization and Its Applications 96, 243-254 (2014).