I. R. C. Sari, R. D. Ridwan, and D. S. Ernawati, “Inhibitory effects of siwak (Salvadora persica. L) extract on the growth of Enterococcus faecalis planktonics and biofilms by in vitro”, Dent. J., vol. 49, no. 3, pp. 158–162, Sep. 2016.