OECD Report on Attribution of Profits to Permanent Establishments. 2010. URL: www.oecd.org/ctp/transfer-pricing/45689524.pdf.

OECD Model Convention on Income and Capital (2008). Article 7. § 1: «The profits of an enterprise of a Contracting State shall be taxable only in that State unless the enterprise carries on business in the other Contracting State through a permanent establishment situated therein. If the enterprise carries on business as aforesaid, the profits of the enterprise may be taxed in the other State but only so much of them as is attributable to that permanent establishment».