ARTICLE 19
Professors and Teachers
(1) An individual who visits a Contracting State at the invitation of that State or of a university, college, school, museum or other cultural institution of that State or under an official programme of cultural exchange for a period not exceeding two years solely for the purpose of teaching, giving lectures or carrying out research at such institution 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 his remuneration for such activity, provided that such remuneration is derived by him from outside that State.
(2) The provisions of this Article shall not apply to income from research if such research is undertaken not in the public interest but wholly or mainly for the private benefit of a specific person or persons.