Spektra, Editor. “FRONT MATTER SPEKTRA VOLUME 5 ISSUE 1, APRIL 2020”. Spektra: Jurnal Fisika dan Aplikasinya 5, no. 1 (April 30, 2020). Accessed April 22, 2025. http://103.8.12.212:33180/unj/index.php/spektra/article/view/15140.