TY  - JOUR
AU  - YOSHIKAWA, Yukio
TI  - Open-ended Variety of Tessellation Made of Congruent Triangles : An Example of Open-ended Approach
T2  - Journal of Japan Society of Mathematical Education. Mathematical education
SN  - 0021471X
PY  - 1999
DA  - 1999/05/01
VL  - 81
IS  - 5
SP  - 163-171
UR  - http://ci.nii.ac.jp/naid/110003729296/en/
ER  -