The Stability of a Generalized Radical Reciprocal Quadratic Functional Equation in Felbin’s Space
          Ravi, K.; Rassias,  J. M.; Pinelas, Sandra; Narasimman, P.  
          
          Pan-American Mathematical Journal, 24(1) (2014), 75-92  
          http://www.internationalpubls.com/Journals/index.PanAmerican.pdf  
           
            
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