@article{JRAM_1983__342_152541,
     author = {Enrico Bombieri and Julia Mueller},
     title = {On effective measures of irrationality for ... and related numbers.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {173--196},
     publisher = {mathdoc},
     volume = {342},
     year = {1983},
     zbl = {0516.10024},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1983__342_152541/}
}