@article{JIS_2009__12_6_a4,
     author = {Luca, Florian and Mej{\'\i}a Huguet, V. Janitzio and Nicolae, Florin},
     title = {On the {Euler} function of {Fibonacci} numbers},
     journal = {Journal of integer sequences},
     publisher = {mathdoc},
     volume = {12},
     number = {6},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_6_a4/}
}