L. T. Loan, D. C. Doanh, H. N. Thang, N. T. Viet Nga, P. T. Van, and P. T. Hoa, “Entrepreneurial behaviour: The effects of the fear and anxiety of Covid-19 and business opportunity recognition”, EBER, vol. 9, no. 3, pp. 7–23, May 2021, doi: 10.15678/EBER.2021.090301.