@article{10_4064_aa97_2_6,
     author = {Damien Roy},
     title = {An arithmetic criterion for the values
of the exponential function},
     journal = {Acta Arithmetica},
     pages = {183--194},
     publisher = {mathdoc},
     volume = {97},
     number = {2},
     year = {2001},
     doi = {10.4064/aa97-2-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa97-2-6/}
}