ARTICLE 20
Professors, Teachers and Students
(1) Remuneration which a professor or teacher who is a resident of a Contracting State and who visits the other Contracting State for a period not exceeding two years for the purpose of carrying out advanced study or research or of teaching at a university, college, school or other educational institution receives for those activities shall not be taxed in that other State.
(2) Paragraph (1) of this Article shall apply to income from research only if such research is undertaken in the public interest and not primarily for the private benefit of a specific person or persons.
(3) Payments which a student or business apprentice 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 solely for the purpose of his education or training receives for the purpose of his maintenance, education or training shall not be taxed in that State, provided that such payments arise from sources outside that State.