REMEIKIENE, Rita; GASPARENIENE, Ligita; SCHNEIDER, Friedrich Georg. The definition of digital shadow economy. Technological and Economic Development of Economy, [S. l.], v. 24, n. 2, p. 696–717, 2018. DOI: 10.3846/20294913.2016.1266530. Disponível em: https://journals.vilniustech.lt/index.php/TEDE/article/view/127. Acesso em: 12 may. 2025.