HUR-UGR-UJR Stabilities of a kl-cubic Funcional Equation in Quasi-beta-normed Spaces: Direct and Fixed Point Methods
          K. Ravi; Pinelas, Sandra; R. Jamina  
          
          Enlightenment of Pure and Applied Mathematics, 1(2) (2015), 61-78  
          http://aditisci.com/index.php?act=arti&jid=50&volId=40&issuId=51&arti=195&view=1  
           
            
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