Artikel 16

For the purposes of the Convention, where a State has two or more territorial units in which different systems of law apply to matrimonial property regimes, any reference to the national law of such a State shall be construed as referring to the system determined by the rules in force in that State.
In the absence of such rules, a reference to the State of which a spouse is a national shall be construed, for the purposes of sub-paragraph 1 of the second paragraph of Article 3 and sub-paragraph 1 of the second paragraph of Article 6, as referring to the territorial unit where that spouse had his or her last habitual residence; and, for the purposes of the second paragraph of Article 4, a reference to the State of the common nationality of the spouses shall be construed as referring to the last territorial unit, if any, where each has had a habitual residence.