International organizations — Immunity — Jurisdictional immunity — United Nations High Commissioner for Refugees — Convention on the Privileges and Immunities of the Specialized Agencies of the United Nations — Article IX, Section 31 — Duty of agencies to make available alternative procedures for the settlement of disputes

International organizations — Immunity — Waiver — Effect of failure of international organization to lodge a reply to proceedings brought against it — Whether ever constituting waiver — Requirement of express statement of waiver — Passage of time following service of writ without reply — Whether constituting proof of refusal to submit to jurisdiction — The law of Argentina