@article{JRAM_1977__296_151942,
     author = {K. V\"a\"an\"anen},
     title = {On the simultaneous approximation of certain numbers.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {205--211},
     publisher = {mathdoc},
     volume = {296},
     year = {1977},
     zbl = {0356.10025},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1977__296_151942/}
}