Smiraglia, Claudio, et al. “Preliminary Results of Two Ice Core Drillings on Monte Rosa (Colle Gnifetti and Colle Del Lys), Italian Alps”. Geografia Fisica E Dinamica Quaternaria, vol. 23, no. 2, Dec. 2000, pp. 165-72, https://www.gfdq.glaciologia.it/index.php/GFDQ/article/view/454.