Jekti, D. S. D., Soemohardjo, S., & Muttaqin, Z. (2008). The Absence of Urease Enzymatic Activity of Helicobacter pylori Coccoid Form. The Indonesian Journal of Gastroenterology, Hepatology, and Digestive Endoscopy, 9(2), 35–41. https://doi.org/10.24871/92200835-41