P. Santanach, P., Casas, J. M., Gratacós, O., Sàbat, F., Liesa, M., Muñoz, J. A., & Sàbat, F. (2011). Variscan and Alpine structure of the hills of Barcelona: geology in an urban area. Journal of Iberian Geology, 37(2), 121-136. https://doi.org/10.5209/rev_JIGE.2011.v37.n2.2