Please check OPIC web https://opicon.jp/registration/.
Sales of back issues of OWPT2019, OWPT2020, OWPT2021, OWPT2022 OWPT2023 and OWPT2024： Please contact to Miyamoto (tmiyamot[a]pi.titech.ac.jp).
Web page archives of OWPT2019, OWPT2020, OWPT2021, OWPT2022 OWPT2023 and OWPT2024: