1. A Finishing Method for Higher Roundness of Cylinder;Sonozaki;Journal of the JSPE,1977
2. Lapping High Precision Polygonal Shafts;Kyusojin;Journal of the JSPE,1983
3. Design of Rubber Mold for Ceramic Balls with High Accuracy;Ichikawa;Journal of the JSTP,1991
4. A proposal of New lapping Method for Ceramic Balls;Ichikawa;Journal of the JSPE,1992