JPFA, Editor. “Back Cover JPFA Vol 9 No 2 December 2019”. Jurnal Penelitian Fisika dan Aplikasinya (JPFA) 9, no. 2 (December 31, 2019): ix. Accessed April 29, 2024. https://journal.unesa.ac.id/index.php/jpfa/article/view/7258.