Keller, M. y Krumm, S. 1992. Evidence of an upper ordovician thermo-metamorphic event in the SW-Corner of the Cantabrian Mountains (N-Spain). Estudios Geológicos. 48, 5-6 (dic. 1992), 289–296. DOI:https://doi.org/10.3989/egeol.92485-6395.