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