Journal of Classical Analysis · Volume 14, Issue 2 Hyperstability of a mixed type cubic-quartic functional equation in ultrametric spaces 14-09 Pages 105-120 DOI 10.7153/jca-2019-14-09 Downloads Short PDF Full PDF PNG Authors Youssef Aribou Hajira Dimou Samir Kabbaj Keywords stability hyperstability ultrametric space cubic functional equation Subject classes 39B82 39B52 47H10