Arifin A, Gunawan G, Chandra SA. FABRICATION OF COMPOSITE COPPER/FLY ASH FOAM WITH EGG YOLK AS FOAMING AGENT. Ind. J. Eng. Sci. [Internet]. 2021 Jan. 23 [cited 2026 Jun. 14];1(1):001-9. Available from: https://mail.aps.or.id/journal_old/index.php/ijes/article/view/4