Martin, Yul and permata, Diah and Darajat, Anisa Ulya and Despa, Dikpride and marwansyah, marwansyah and Rahmat, Ali similarity check - Ufer grounding system to minimize risk of lightning strike us-ing concrete mixed with bentonite and coconut fiber. Jurnal Ilmiah Pendidikan Fisika Al-BiRuNi, 9 (1). ISSN 2303-1832