@article{10_4153_CMB_1968_017_8,
     author = {Goebel, K.},
     title = {On the {Minimal} {Lipschitz} {Constant}},
     journal = {Canadian mathematical bulletin},
     pages = {141--143},
     year = {1968},
     volume = {11},
     number = {1},
     doi = {10.4153/CMB-1968-017-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-017-8/}
}