“Using a Proportional Approach to Taxation in Ukraine: Problems and Possible Ways of their Solution”, Ekon. čas. Volins. nac. unìv. ìm. Lesì Ukraïnki, vol. 1, no. 5, pp. 85–90, Apr. 2016, doi: 10.29038/2411-4014-2016-01-85-90.