Ruamsuke, T., P. Ongkunaruk, and T. Leingpibul. “Using Integration Definition for Function Modeling to Define Operational Obstacles in Cold Chain Farm-to-Consumer Delivery During the COVID-19 Pandemic: A Case Study in Thailand”. Science, Engineering and Health Studies, vol. 16, Sept. 2022, p. 22040003, doi:10.14456/sehs.2022.23.