R. Remeikienė, L. Gasparėnienė, Özlem Yorulmaz, M. Schieg, and A. Stasiukynas, “Evaluation of the level of shadow economy in Lithuanian regions”, JBEM, vol. 22, no. 5, pp. 1360–1377, Oct. 2021, doi: 10.3846/jbem.2021.15405.