@article{10_4064_aa126_4_1,
     author = {Jan-Christoph Schlage-Puchta},
     title = {The irrationality of some number theoretical series},
     journal = {Acta Arithmetica},
     pages = {295--303},
     publisher = {mathdoc},
     volume = {126},
     number = {4},
     year = {2007},
     doi = {10.4064/aa126-4-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa126-4-1/}
}