Iz-iddine EL-FASSI , Hamid KHODAEI , Themistocles M. RASSIAS . APPROXIMATE SOLUTION OF A p-th ROOT FUNCTIONAL EQUATION IN NON-ARCHIMEDEAN (2, β)-BANACH SPACES[J]. Acta mathematica scientia, Series B, 2019 , 39(2) : 369 -381 . DOI: 10.1007/s10473-019-0203-9

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