ARTICLE 20
Teachers
A professor or teacher who visits a Contracting State for a period not exceeding two years for the purpose of carrying out advanced study or research or for teaching at a university, college, school or other educational institution in that Contracting State and who is, or was immediately before that visit, a resident of the other Contracting State shall be exempt from tax in the first-mentioned State on any remuneration which he derives from outside the first-mentioned State for such teaching.