Spektra, Editor. “BACK MATTER SPEKTRA VOLUME 6 ISSUE 2, OCTOBER 2021”. Spektra: Jurnal Fisika dan Aplikasinya 6, no. 2 (October 30, 2021). Accessed April 30, 2025. https://journal.unj.ac.id/unj/index.php/spektra/article/view/23879.