Mangado Llach, Javier, et al. “New Data Concerning ‘large blades’ in Catalonia: Apt-Forcalquier Chert in the Penedès (south of Barcelona) During the Late Neolithic - Chalcolithic”. Journal of Lithic Studies, vol. 3, no. 2, Sept. 2016, pp. 481-96, doi:10.2218/jls.v3i2.1833.