creator	Yamasaki, Hiromasa; Fujii, Masahiro; Tanigawa, Yoshikazu; Ueda, Atsumi; Ikehata, Ryo;
journal title	THE ANNALS OF EDUCATIONAL RESEARCH
issue	Issue 34
date of issued	2006-03
SelfDOI	10.15027/14954

creator	Tanigawa, Yoshikazu; Hujii, Masahiro; Yamasaki, Hiroaki; Ueda, Atsumi; Ikehata, Ryo;
journal title	THE ANNALS OF EDUCATIONAL RESEARCH
issue	Issue 35
date of issued	2007-03-20
SelfDOI	10.15027/17425

creator	Ikehata, Ryo; Suzuki, Takashi;
journal title	Hiroshima mathematical journal
volume	Volume 26
issue	Issue 3
date of issued	1996-11

creator	Ikehata, Ryo;
journal title	Hiroshima mathematical journal
volume	Volume 30
issue	Issue 1
date of issued	2000-03