A Discretization Method to Solve Fractional Variational Problems with   Dependence on Hadamard Derivatives
  We provide a fast and simple method to solve fractional variational problems with dependence on Hadamard fractional derivatives. Using a relation between the Hadamard fractional operator and a sum involving integer-order derivatives, we rewrite the fractional problem into a classical optimal control problem. The latter problem is then solved by application of standard numerical techniques. We illustrate the procedure with an example. 
Ricardo Almeida, Nuno R. O. Bastos, Delfim F. M. Torres
math.OC