Efendi, Fikki, Fredy Kurniawan, and Diah Ayu Restuti Wulandari. 2019. “THE EFFECT OF ADDITIVE WITH FOAM AGENT AND COCONUT SHELL ON LIGHTWEIGHT CONCRETE”. Neutron 19 (1), 72 - 79. http://ejournal.worldconference.id/index.php/neutron/article/view/79.