Anggraini, L. D., S. Sunarno, R. B. Utomo, and D. Pramono. “Space Maintainer ‘Y model’ As a Preventive Orthodontic Treatment for Paediatric Patients: A Case Report”. Dental Journal, vol. 54, no. 2, June 2021, pp. 102-7, doi:10.20473/j.djmkg.v54.i2.p102-107.