Long-term hydrological changes in Northern Iberia (4.9–0.9 ky BP) from speleothem Mg/Ca ratios and cave monitoring (Ojo Guareña Karst Complex, Spain) - Cruz, Juncal A.; Turrero, María Jesús; Cáceres, Jorge Omar; Marín-Roldán, Alicia; Ortega Martínez, Ana Isabel; Garralón, Antonio; Sánchez Moreno, Lorenzo; Gómez González, Paloma; Muñoz-García, María Belén; Edwards, Richard Lawrence; Martín Chivelet, Javier (2015)