Article 21Professors and teachers
(1) An individual who visits a Contracting State for the purpose of teaching or engaging in research at a university, college or other recognised educational institution in that Contracting State, and who is or was immediately before that visit a resident of the other Contracting State, shall not be taxed by the first-mentioned Contracting State on remuneration for such teaching or research for a period not exceeding two years from the date of his first visit to that State for such purpose.
(2) This Article shall only apply to income from research if such research is undertaken by the individual in the public interest and not primarily for the benefit of some other private person or persons.