Soegijanto, S., Soejono, D.A. and B., P.S. 2018. Early protection against measles infection in children Immunized with DPT-measles Vaccine at the Age of 4 Months. Paediatrica Indonesiana. 33, 3-4 (Dec. 2018), 52–8. DOI:https://doi.org/10.14238/pi33.3-4.1993.52-8.