ARTICLE 20
Visiting Professors, Researchers and Teachers
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.