«How much is enough?». The Economist. 6 November 2008. http://www.economist.com/node/12501023. Ανακτήθηκε στις 9 June 2011. ««Mr Savater and Rosa Díez, a former Basque Socialist leader, have set up a new party of the radical centre called Union, Progress and Democracy (UPyD), in an effort to combine social liberalism with a defence of the idea of Spain»»