Artikel 4

In respect of sub-paragraph 2 (a) of Article 3 of the present Convention, each Contracting Party may:
(a) in cases where the examination requirements for a foreign university qualification do not include certain subjects prescribed for the similar national qualification, withhold recognition until a supplementary examination has been passed in the subjects in question;
(b) require holders of a foreign university qualification to pass a test in its official language, or one of its official languages, in the event of their studies having been pursued in another language.