Prondanai KASKASEM , Chakkrid KILN-EAM . HYPERSTABILITY OF THE GENERALIZED CAUCHY-JENSEN FUNCTIONAL EQUATION IN ULTRAMETRIC SPACES[J]. Acta mathematica scientia, Series B, 2019 , 39(4) : 1017 -1032 . DOI: 10.1007/s10473-019-0408-y

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