@article{1138845644,
author = {Sawaki, Sumio and Takagi, Hitoshi},
title = {On certain conditions for a $K$-space to be isometric to a sphere},
journal = {Kodai Math. Sem. Rep.},
volume = {20},
number = {1},
year = {1968},
pages = { 198-208},
language = {en},
url = {http://dml.mathdoc.fr/item/1138845644}
}
Sawaki, Sumio; Takagi, Hitoshi. On certain conditions for a $K$-space to be isometric to a sphere. Kodai Math. Sem. Rep., Tome 20 (1968) no. 1, pp. 198-208. http://gdmltest.u-ga.fr/item/1138845644/