Spektra, Editor. “FRONT MATTER SPEKTRA VOLUME 5 ISSUE 1, APRIL 2020”. Spektra: Jurnal Fisika dan Aplikasinya 5, no. 1 (April 30, 2020). Accessed April 19, 2024. https://journal.unj.ac.id/unj/index.php/spektra/article/view/15140.