@article{MZ_1978__161_172698,
     author = {Shinji Yamashita},
     title = {On the {John} {Constant.}},
     journal = {Mathematische Zeitschrift},
     pages = {185--188},
     year = {1978},
     volume = {161},
     zbl = {0389.30004},
     url = {http://geodesic.mathdoc.fr/item/MZ_1978__161_172698/}
}