Identical to Mass.R.Civ.P. 44.1
Rules of Domestic Relations Procedure Domestic Relations Procedure Rule 44.1: Determination of foreign law
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A party who intends to raise an issue concerning the law of the United States or of any state, territory or dependency thereof or of a foreign country shall give notice in his pleadings or other reasonable written notice. The court, in determining such law, may consider any relevant material or source, including testimony, whether or not submitted by a party or admissible under Rule 43. The court's determination shall be treated as a ruling on a question of law.