D. Ulfaty, M. Diantoro, W. Loeksmanto, and M. Tjia, “Oxygen Doping Effects on the Re-entrant Point of Vortex Melting Line in Bi2Sr2CaCu2O8+δ and YBa2Cu3O7-δ Superconducting System”, ijp, vol. 14, no. 3, pp. 87-91, Nov. 2016.