Comparison of Placement of Textbooks and Teaching of Geometry in Japan and the United State of America. the Annual report of the Faculty of Education Iwate University. 2001. Vol.61 No.1
日本の分数教育の問題点. 数学教育学会研究紀要. 2000. Vol.41. No.1・2
On the Problems of Teaching Fractions in Japan. Bulletin for Mathematics Education Study. 2000. Vol.41. No.1・2