Variability, mobility and site function in Pre-Pyrenean Middle Paleolithic. The examples of Roca dels Bous and Cova Gran (Iberian South-Eastern Pre-Pyrenees) - Roda Gilabert, Xavier; Samper Carro, Sofía; Casanova Martí, Joel; Roy Sunyer, Miquel; Vega Bolivar, Susana; Mora Torcal, Rafael; Martínez Moreno, Jorge; Benito-Calvo, Alfonso (2012)