Code of Organization and Civil Procedure (Cap. 12), article 719

719. The party to whose oath a reference is made shall, if present at the hearing of the cause, forthwith declare whether he proposes to answer the questions, or to defer them back to the adversary. Suppletory oath.720. Where the evidence produced is not of itself sufficient to establish the proof required, and the court is of opinion that such evidence, if supplemented by the oath of the party, would estab lish to its satisfaction the proof required, it shall be lawful for the court to require a suppletory oath. Oath may be administered before or after judgment.