Costantini, Edoardo A.C., and Damiano Damiani. “Clay Minerals and the Development of Quaternary Soils in Central Italy”. Revista Mexicana De Ciencias Geológicas, vol. 21, no. 1, May 2018, pp. 144-59, https://rmcg.geociencias.unam.mx/index.php/rmcg/article/view/911.