@article{MOMA_1974__78_186329,
     author = {T.W. Cusick},
     title = {The {Two-Dimensional} {Diophantine} {Approximation} {Constant.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {297--304},
     publisher = {mathdoc},
     volume = {78},
     year = {1974},
     zbl = {0294.10023},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1974__78_186329/}
}