@article{FCAA_2004_7_4_a5,
     author = {Duarte Ortigueira, Manuel and Coito, Fernando},
     title = {From {Differences} to {Derivatives}},
     journal = {Fractional calculus and applied analysis},
     pages = {459--471},
     publisher = {mathdoc},
     volume = {7},
     number = {4},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/FCAA_2004_7_4_a5/}
}