An individual who visits one of the Contracting States for the
purpose of teaching or carrying out 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 in
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 that purpose.
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.