d. subject to the provisions of Article 59, judicial decisions and the teachings of the most highly qualified publicists of the various nations, as subsidiary means for the determination of rules of law. 2. This provision shall not prejudice the power of the Court to decide a case ex aequo et bono, if the parties agree thereto. CHAPTER III PROCEDURE Article 39 1. The official languages of the Court shall be French and English. If the parties agree that the case shall be conducted in French, the judgment shall be delivered in French. If the parties agree that the case shall be conducted in English, the judgment shall be delivered in English. 2. In the absence of an agreement as to which language shall be employed, each party may, in the pleadings, use the language which it prefers; the decision of the Court shall be given in French and English. In this case the Court shall at the same time determine which of the two texts shall be considered as authoritative. 3. The Court shall, at the request of any party, authorize a language other than French or English to be used by that party. Article 40 1. Cases are brought before the Court, as the case may be, either by the notification of the special agreement or by a written application addressed to the Registrar. In either case the subject of the dispute and the parties shall be indicated. 2. The Registrar shall forthwith communicate the application to all concerned.