Chang, Ick-Soon; Lee, Y.-H.; Park, W.-G. Fuzzy stability for the functional equation stemming from quadratic-additive mapping. (English) Zbl 1254.39013 Int. J. Pure Appl. Math. 77, No. 4, 517-532 (2012). Reviewer: Jacek Chmieliński (Kraków) MSC: 39B82 39B52 46S40 PDFBibTeX XMLCite \textit{I.-S. Chang} et al., Int. J. Pure Appl. Math. 77, No. 4, 517--532 (2012; Zbl 1254.39013) Full Text: Link
Chang, Ick-Soon; Park, Won-Gil Stability of an additive functional inequality. (English) Zbl 1256.39018 Int. J. Pure Appl. Math. 77, No. 1, 85-90 (2012). Reviewer: Gian Luigi Forti (Milano) MSC: 39B82 39B52 39B62 PDFBibTeX XMLCite \textit{I.-S. Chang} and \textit{W.-G. Park}, Int. J. Pure Appl. Math. 77, No. 1, 85--90 (2012; Zbl 1256.39018) Full Text: Link
Lee, Yang-Hi; Park, Won-Gil; Chang, Ick-Soon Stability for mixed type of additive and quadratic functional equation in random normed spaces via fixed point method. (English) Zbl 1253.39030 Int. J. Pure Appl. Math. 74, No. 2, 275-286 (2012). Reviewer: Maryam Amyari (Mashhad) MSC: 39B82 39B52 46S50 PDFBibTeX XMLCite \textit{Y.-H. Lee} et al., Int. J. Pure Appl. Math. 74, No. 2, 275--286 (2012; Zbl 1253.39030) Full Text: Link