@article{MAN_1972__197_162279,
     author = {T.W. Cusick},
     title = {Formulas for {Some} {Diophantine} {Approximation} {Constants.}},
     journal = {Mathematische Annalen},
     pages = {182--188},
     publisher = {mathdoc},
     volume = {197},
     year = {1972},
     zbl = {0225.10032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1972__197_162279/}
}