Schneider, Friedrich and Buehn, Andreas. "Shadow Economy: Estimation Methods, Problems, Results and Open questions" Open Economics, vol. 1, no. 1, 2018, pp. 1-29. https://doi.org/10.1515/openec-2017-0001
Schneider, F. & Buehn, A. (2018). Shadow Economy: Estimation Methods, Problems, Results and Open questions. Open Economics, 1(1), 1-29. https://doi.org/10.1515/openec-2017-0001
Schneider, F. and Buehn, A. (2018) Shadow Economy: Estimation Methods, Problems, Results and Open questions. Open Economics, Vol. 1 (Issue 1), pp. 1-29. https://doi.org/10.1515/openec-2017-0001
Schneider, Friedrich and Buehn, Andreas. "Shadow Economy: Estimation Methods, Problems, Results and Open questions" Open Economics 1, no. 1 (2018): 1-29. https://doi.org/10.1515/openec-2017-0001
Schneider F, Buehn A. Shadow Economy: Estimation Methods, Problems, Results and Open questions. Open Economics. 2018;1(1): 1-29. https://doi.org/10.1515/openec-2017-0001