@article{FCAA_2011_14_1_a5,
     author = {Atanackovic, Teodor and Pilipovic, Stevan},
     title = {Hamilton{\textquoteright}s {Principle} with {Variable} {Order} {Fractional} {Derivatives}},
     journal = {Fractional calculus and applied analysis},
     pages = {94--109},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/FCAA_2011_14_1_a5/}
}