Center for Social and Economic Research (CASE) & Institute for Advanced Studies (2016). Study and Reports on the VAT Gap in the EU-28 Member States: 2016 Final Report TAXUD/2015/CC/131. A Study for the Directorate General Taxation and Customs Union. Retrieved from https://ec.europa.eu/taxation_customs/sites/taxation/files/2016-09_vat-gap-report_final.pdf [19.3.2018]
Mathews, K. (2003). VAT evasion and VAT avoidance: Is there a European Laffer Curve for VAT?, International Review for Applied Economics, 17 (1), 105-114. https://doi.org/10.1080/71367316210.1080/713673162
OECD (2008). Monitoring taxpayer’s compliance: A practical guide based on revenue body experience. Forum on Tax Administration: Compliance Sub-group. Retrieved from http://www.oecd.org/tax/taxadministration/40947920.pdf
SKAT – Danish Tax and Customs Administration (2010). Business sector analysis. Compliance with tax and VAT rules by businesses in Denmark, Tax year 2006.