@article{10_4064_aa133_3_1,
     author = {Kevin Ford and Yong Hu},
     title = {Divisors of the {Euler} and {Carmichael} functions},
     journal = {Acta Arithmetica},
     pages = {199--208},
     publisher = {mathdoc},
     volume = {133},
     number = {3},
     year = {2008},
     doi = {10.4064/aa133-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa133-3-1/}
}