| The Euler-Lagrange and Legendre equations for functionals involving distributed-order fractional derivativesAlmeida, Ricardo; Morgado, M. Luísa
 Applied Mathematics and Computation , 331 (2018), 394-403 https://www.sciencedirect.com/science/article/pii/S0096300318301875?via%3Dihub
 
 
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