In the paper two types of stability and of b-stability of functional equations are distinguished.
@article{bwmeta1.element.doi-10_1515_amsil-2016-0001, author = {Zenon Moszner}, title = {On the Normal Stability of Functional Equations}, journal = {Annales Mathematicae Silesianae}, volume = {30}, year = {2016}, pages = {111-128}, zbl = {1281.39042}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.doi-10_1515_amsil-2016-0001} }
Zenon Moszner. On the Normal Stability of Functional Equations. Annales Mathematicae Silesianae, Tome 30 (2016) pp. 111-128. http://gdmltest.u-ga.fr/item/bwmeta1.element.doi-10_1515_amsil-2016-0001/