ARTICLE 21
Teachers and Researchers
(1) An individual who is or was immediately before visiting a Contracting State a resident of the other Contracting State and who at the invitation of the Government of the first-mentioned Contracting State or of a university college, school, museum or other cultural institution in that first-mentioned Contracting State or under an official programme of cultural exchange is present in that Contracting State for a period not exceeding two consecutive years solely for the purpose of teaching giving lectures or carrying out research at such institution shall be exempt from tax in that Contracting 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 public's interest but wholly or mainly for the private benefit of a specific person or persons.