Duarte, Luís Vitor, et al. “Organic-Rich Facies in the Sinemurian and Pliensbachian of the Lusitanian Basin, Portugal: Total Organic Carbon Distribution and Relation to Transgressive-Regressive Facies Cycles”. Geologica Acta, vol. 8, no. 3, Oct. 2010, pp. 325-40, https://raco.cat/index.php/GeologicaActa/article/view/202809.