@article{10_4064_aa162_3_6,
     author = {Florian Luca and Carl Pomerance},
     title = {On the range of {Carmichael's} universal-exponent function},
     journal = {Acta Arithmetica},
     pages = {289--308},
     publisher = {mathdoc},
     volume = {162},
     number = {3},
     year = {2014},
     doi = {10.4064/aa162-3-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa162-3-6/}
}