AHMADANI, A., MIDDELBERG, S.L., OBERHOLZER, M. and BUYS, P. 2021. THE EFFECTS OF COVID-19 ON OIL-PRODUCING ECONOMIES: A CONSIDERATION OF NIGERIAN AND ‎SAUDI ARABIAN VAT INCREASES. Studia Universitatis Babeș-Bolyai Negotia. 66, 4 (Dec. 2021), 7–18. DOI:https://doi.org/10.24193/subbnegotia.2021.4.01.