ARTICLE 20
Teachers and Researchers
(1) Remuneration derived by an individual who is or was immediately before visiting a Contracting State, a resident of the other Contracting State and who is present in the first-mentioned State for the primary purpose of teaching, giving lectures or conducting scientific researches shall not be taxed in the first-mentioned State, for a period of two years from the date of his first arrival in the first-mentioned State.
(2) This paragraph shall not apply to remuneration and income from research if such research is undertaken for persons and enterprises with business purposes.