Surjono, Achmad, Surjantoro Surjantoro, Tonny Sadjimin, and Ismangun Ismangun. 1973. “Lactose Tolerance Test on Indonesian Newborn Infants”. Paediatrica Indonesiana 13 (1), 11-6. https://doi.org/10.14238/pi13.1.1973.11-6.