OECD Model Tax Convention on Income and on Capital: Condensed Version. Paris, OECD Publishing, 2014. Commentary to Art. 10. § 31, 32. P. 195–196.

Ibid. Commentary to Art. 11. § 24, 25. P. 218–219.

Ibid. Commentary to Art. 12. § 20, 21. P. 237–238.

OECD Report on Attribution of Profits to Permanent Establishments (2008). § 97. P. 31.

Annual Tax Act implements Authorized OECD Approach into German tax law. URL: http://taxinsights.ey.com/archive/archive-pdfs/Annual-Tax-Act-implements-OECD-Approach-in-German-tax-law-.pdf.