“Pope Benedict in shock resignation”. BBC.co.uk. (11 February 2013). http://www.bbc.co.uk/news/world-2141130411 February 2013閲覧. "I declare that I renounce the ministry of Bishop of Rome, Successor of Saint Peter, entrusted to me by the cardinals on 19 April 2005, in such a way, that as from 28 February 2013, at 20:00 hours, the See of Rome, the See of Saint Peter, will be vacant and a conclave to elect the new Supreme Pontiff will have to be convoked by those whose competence it is."
CIC 1917Can. 221. Si contingat ut Romanus Pontifex renuntiet, ad eiusdem renuntiationis validitatem non est necessaria Cardinalium aliorumve acceptatio.
