Siregar, Dini Rizqi DwiKunti, Sigit Dwi Yudanto, Septian Adi Chandra, Eka Feby Ronauli Lubis, Syahrul Humaidi, and Nono Darsono. 2021. “Improvement of the Superconducting Properties of Carbon Addition on Bi1.6Pb0.4Sr2 Ca2Cu3O10+δ Prepared through the Two-Step Sintering Process”. Journal of Metals, Materials and Minerals 31 (4). Bangkok, Thailand:76-81. https://jmmm.material.chula.ac.th/index.php/jmmm/article/view/1187.