Boomsma, M., van Dop, I., Willems, M. and Al-Toma, A. (2009) “An unusual cause of upper gastrointestinal obstruction in an adult: annnular pancreas”, Journal of Gastrointestinal and Liver Diseases, 18(1), pp. 117–124. Available at: https://www.jgld.ro/jgld/index.php/jgld/article/view/2009.1.194 (Accessed: 13 August 2026).