Soemohardjo, Soewignjo, et al. “Detection of Hepatitis B Virus Pre-Core Mutant by Allele Specific Polymerase Chain Reaction”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, vol. 14, no. 1, Sept. 2014, pp. 19-23, doi:10.24871/141201319-23.