Ha L, Phuong N, Giam D, Trung T. Theoretical and Practical Issues of Research on the Consumption Needs for Safe Foods in Vietnam Using the Willingness to Pay Model. vjas [Internet]. 5Mar.2021 [cited 2May2024];3(3):756-70. Available from: https://vjas.vnua.edu.vn/index.php?journal=vjas&page=article&op=view&path[]=vjas.2020.3.3.09