Fassnacht, S.R., Heun, C.M., López Moreno, J.I. and Latron, J. 2013. Variability of snow density measurements in the Río Esera Valley, Pyrenees Mountains, Spain. Cuadernos de Investigación Geográfica. 36, 1 (Jun. 2013), 59–72. DOI:https://doi.org/10.18172/cig.1227.