Khoswanto, C., Arijani, E., & Soesilawati, P. (2008). Cytotoxicity test of 40, 50 and 60% citric acid as dentin conditioner by using MTT assay on culture cell line. Dental Journal, 41(3), 103–106. https://doi.org/10.20473/j.djmkg.v41.i3.p103-106