@article{MS2_1981__48_166750,
     author = {Walter Stromquist},
     title = {The maximum distance between two-dimensional {Banach} spaces.},
     journal = {Mathematica Scandinavica},
     pages = {205--225},
     publisher = {mathdoc},
     volume = {48},
     year = {1981},
     zbl = {0475.46011},
     url = {http://geodesic.mathdoc.fr/item/MS2_1981__48_166750/}
}