Miftahussurur, Muhammad, Manu Tandan, and Dadang Makmun. “The Role of SpyGlass Direct Visualization System on Patient With Indeterminate Biliary Strictures: A Case Report”. Acta Medica Indonesiana 53, no. 4 (January 10, 2022): 460. Accessed December 22, 2025. http://actamedindones.org/index.php/ijim/article/view/1184.