Variational methods for the solution of fractional discrete/continuous Sturm-Liouville problems
          Almeida, R.; Malinowska, A.B. ; Morgado, M. Luísa; Odzijewicz, T.  
          
          Journal of Mechanics of Materials and Stuctures, 12(1) (2017), 3–21  
           https://msp.org/jomms/2017/12-1/jomms-v12-n1-p02-p.pdf  
           
            
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