@article{10_4064_aa_43_4_333_348,
     author = {M. Takeuchi},
     title = {An effective lower bound for a certain exponential function},
     journal = {Acta Arithmetica},
     pages = {333--348},
     publisher = {mathdoc},
     volume = {43},
     number = {4},
     year = {1983},
     doi = {10.4064/aa-43-4-333-348},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-43-4-333-348/}
}