AHMADANI, A., S. L. MIDDELBERG, M. OBERHOLZER, and P. BUYS. “THE EFFECTS OF COVID-19 ON OIL-PRODUCING ECONOMIES: A CONSIDERATION OF NIGERIAN AND ‎SAUDI ARABIAN VAT INCREASES”. Studia Universitatis Babeș-Bolyai Negotia, vol. 66, no. 4, Dec. 2021, pp. 7-18, doi:10.24193/subbnegotia.2021.4.01.