Dennis, D., & Abidin, T. (2009). The effect of watermelon frost on prostaglandin E<sub>2</sub> (PGE<sub>2</sub>) in inflamed pulp tissue (in vitro study). Dental Journal, 42(2), 82–85. https://doi.org/10.20473/j.djmkg.v42.i2.p82-85