1. 1) Mizumura, M.:Bulletin of JSTP, 5-55 (2022), 416-421.
2. 2) Tube Forming Committee:Bulletin of JSTP, 5-56 (2022), 489-4931.
3. 3) Harada, M.:Proc. 73th Jpn. Jt. Conf. Technol. Plast., (2022), 49-50.
4. 4) Tatsuno, D., Yoneyama, T., Kinari, T., Sakanishi, E., Ochiai, T. and Taniichi, Y.:Int. J. Mater. Form., 14-4 (2021), 753-762.
5. 5) Taniichi, Y., Yoneyama, T., Kinari, T. and Tatsuno, D.:2021 Jpn. Spring Conf. Technol. Plast., (2021), 253-254.