Machado, G., I. Dias da Silva, and P. Almeida. “Palynology, Stratigraphy and Geometry of the Pennsylvanian Continental Santa Susana Basin (SW Portugal)”. Journal of Iberian Geology 38, no. 2 (November 2, 2012): 429–448. https://doi.org/10.5209/rev_JIGE.2012.v38.n2.40467.