@article{MAN_1971__192_162170,
     author = {Peter BUNDSCHUH},
     title = {Irrationalit\"atsma{\ss}e f\"ur ea, a = 0 rational oder {Liouville-Zahl.}},
     journal = {Mathematische Annalen},
     pages = {229--242},
     publisher = {mathdoc},
     volume = {192},
     year = {1971},
     zbl = {0206.05803},
     url = {http://geodesic.mathdoc.fr/item/MAN_1971__192_162170/}
}