ARTICLE 20
Teachers, Students and Trainees
(1) Payments which a student or business apprentice, trainee or researcher who is a national of a Contracting State and who is present in the other Contracting 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.
(2) Likewise, remuneration received by a teacher or by an instructor who is a national of a Contracting State and who is present in the other Contracting State for the primary purpose of teaching or engaging in scientific research for a period or periods not exceeding two years shall be exempt from tax in that other State on his remuneration from personal services from teaching or research, provided that such payments arise from sources outside that State.
This paragraph shall not apply to income from research if such research is undertaken primarily for the private benefit of a specific person or persons.