Jingxian Huang. Modelling the Income Elasticity of Demand of Different Beverages Among CBC Hefei No.1 Secondary School Students in the Context of Covid-19. IST [nternet]. 2022 Aug. 1 [cited 2025 Apr. 30];1(1):13-21. vailable from: https://www.paradigmpress.org/ist/article/view/75