@article{1178243550, author = {\^Otsuki, Tominosuke}, title = {On focal elements and the spheres}, journal = {Tohoku Math. J. (2)}, volume = {17}, number = {4}, year = {1965}, pages = { 285-304}, language = {en}, url = {http://dml.mathdoc.fr/item/1178243550} }
Ôtsuki, Tominosuke. On focal elements and the spheres. Tohoku Math. J. (2), Tome 17 (1965) no. 4, pp. 285-304. http://gdmltest.u-ga.fr/item/1178243550/