Deta, U.A. 2021. Introduction, Author Guidlines, and Table of Contents JPFA Volume 11 Nomor 1 Juni 2021. Jurnal Penelitian Fisika dan Aplikasinya (JPFA). 11, 1 (Oct. 2021), ii-vi. DOI:https://doi.org/10.26740/jpfa.v11n1.pii-vi.