Siregar, D.R.D., Yudanto, S.D. , Chandra, S.A., Lubis, E.F.R., Humaidi, S. and Darsono, N. 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 (Dec. 2021), 76–81.