C. F. Winkler Prins, «The road section east of Valdeteja with its continuation along the arroyo de Barcaliente (Curueño Valley, León ) (with a “Note on l.eonardophyllum leonese sp. nov.” by G. E. DE GROOT)», Trab. Geol., vol. 4, n.º 4, pp. 677–687, dic. 1971.