Correia G. G., Duarte L. V., Pereira A. y Silva R. L. (2012). Outcrop gamma-ray spectrometry: Applications to the Sinemurian–Pliensbachian organic-rich facies of the Lusitanian Basin (Portugal). Journal of Iberian Geology, 38(2), 373-388. https://doi.org/10.5209/rev_JIGE.2012.v38.n2.40464