@article{10_4064_aa118_4_5,
     author = {Jaroslav Han\v{c}l and Robert Tijdeman},
     title = {On the irrationality of factorial series},
     journal = {Acta Arithmetica},
     pages = {383--401},
     publisher = {mathdoc},
     volume = {118},
     number = {4},
     year = {2005},
     doi = {10.4064/aa118-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa118-4-5/}
}