Abdullah, Murdani, et al. “Expression of Cyclooxygenase Enhances Tumor Invasion and Metastasis in Human Gastric Carcinoma”. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, vol. 5, no. 2, Jan. 2004, pp. 43-47, doi:10.24871/52200443-47.