ARTICLE 21
Professors, Teachers and Researchers
(1) A professor or teacher who makes a temporary visit to a Contracting State for a period not exceeding two years for the purpose of teaching or conducting research at a university, college, school or other educational institution, owned by the Government or non-profit organizations, and who is, or immediately before such visit was, a resident of the other Contracting State shall be exempt from tax in the first-mentioned Contracting State in respect of remuneration for such teaching or research.
(2) This Article shall not apply to income from research if such research is undertaken primarily for the private benefit of a specific person or persons.