González-Gutiérrez, R. B., J. Santos-González, A. Gómez-Villar, E. Alonso-Herrero, A. García-de Celis, M. Cano, in J. M. Redondo-Vega. „Glaciokarst Landforms in the Siera De Los Grajos, Babia and Luna Natural Park (Cantabrian Mountains, NW Spain)“. Acta Carsologica, let. 46, št. 2-3, december 2017, doi:10.3986/ac.v46i2-3.5001.