U-series dating of Paleolithic art in 11 caves in Spain - Pike, Alistair W. G.; Hoffmann, Dirk; García Diez, Marcos; Pettitt, Paul B.; Alcolea González, José Javier; Balbín Behrmann, Rodrigo de; González Sainz, César; Heras, Carmen de las; Lasheras, José Antonio; Montes Barquín, Ramón; Zilhão, João (2012)