A Research on The Formability of PVC Sheet in Single Point Incremental Forming (SPIF) TechnologyNguyen Thanh Nam, Nguyen Hoang Hiep, Nguyen Tan Hung, Tran Trong Hy and Ho Huu HanE3S Web Conf., 327 (2021) 05005DOI: https://doi.org/10.1051/e3sconf/202132705005