González-Gutiérrez, R.B., Santos-González, J., Gómez-Villar, A., Alonso-Herrero, E., García-de Celis, A., Cano, M. and Redondo-Vega, J.M. 2017. Glaciokarst landforms in the Siera de los Grajos, Babia and Luna natural park (Cantabrian Mountains, NW Spain). Acta Carsologica. 46, 2-3 (Dec. 2017). DOI:https://doi.org/10.3986/ac.v46i2-3.5001.