@article{MOMA_1972__76_177595,
     author = {J.M. Wills and U. Betke},
     title = {Untere {Schranken} f\"ur zwei diophantische {Approximations-Funktionen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {214--217},
     publisher = {mathdoc},
     volume = {76},
     year = {1972},
     zbl = {0239.10016},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1972__76_177595/}
}