[1] Fukagawa, H., Pedoe, D.: 
Japanese Temple Geometry Problems. Charles Babbage Research Center, Winnipeg 1989. 
MR 1044556[2] Fukagawa, H., Rigby, J. F.: 
Traditional Japanese Mathematics Problems of the 18th and 19th Centuries. SCT Press, Singapore, v tisku. 
MR 2005730 | 
Zbl 1059.01002[3] Rothman, T., Fukagawa, H.: Japanese Temple Geometry. Scientific American, May 1998.
[4] Suzuki, F.: Equilateral triangles pass through three vertices of a square. Mathematical gazette, v tisku.