@article{10_4064_aa_58_4_363_385,
     author = {Paul Erd\H{o}s and Carl Pomerance and Eric Schmutz},
     title = {Carmichael's lambda function},
     journal = {Acta Arithmetica},
     pages = {363--385},
     publisher = {mathdoc},
     volume = {58},
     number = {4},
     year = {1991},
     doi = {10.4064/aa-58-4-363-385},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-58-4-363-385/}
}