"Jin-ichi;Itoh|Takashi;Sakai|","Cut Loci and Distance Functions","Mathematical Journal of Okayama University","0030-1566","2007-01","49","1","","","","","","http://ousar.lib.okayama-u.ac.jp/33118",""
"Takashi;Sakai|","Warped Products and Riemannian Manifolds Admitting a Function Whose Gradient is of Constant Norm","Mathematical Journal of Okayama University","0030-1566","1997-01","39","1","","","","","","http://ousar.lib.okayama-u.ac.jp/33580",""
"Jin-ichi;Itoh|Takashi;Sakai|","On quasiconvexity and contractibility of domains in R^n","Mathematical Journal of Okayama University","0030-1566","1985-01","27","1","","","","","","http://ousar.lib.okayama-u.ac.jp/33430",""
"Takashi;Sakai|","On continuity of injectivity radius function","Mathematical Journal of Okayama University","0030-1566","1983-06","25","1","","","","","","http://eprints.lib.okayama-u.ac.jp/33382",""