Jankhao, Sirinat, Aree Teeraparbseree, Dollaya Buakham, Pasuree Sangsupawanich, Nikorn Sirivongpaisal, and Nitipat Laomongkholchaisri. 2022. “Simulation and Optimization of the Pneumatic Tube Drug Delivery System: A Case Study of Inpatient Wards from Songklanagarind Hospital”. Thai Industrial Engineering Network Journal 8 (1):72-83. https://ph02.tci-thaijo.org/index.php/ienj/article/view/245997.