1. Ames, A. (1998). A documentation of glacier tongue variations and lake developments in the Cordillera Bianca, Peru. Zeitschrift für Gletscherkunde und Glazialgeologie
34, 1–36.
2. Barry, R. G., and Seimon, A. (2000). Research for mountain area development: Climatic fluctuations in the mountains of the Americas and their significance. Ambio
29, 364–370.
3. Brecher, H., and Thompson, L. G. (1993). Measurement of the retreat of Qori Kalis glacier in the tropical Andes of Peru by terrestrial photogrammetry. Photogrammetric Engineering and Remote Sensing
59, 1017–1022.
4. Chen, J., and Ohmura, A. (1990). Estimation of Alpine glacier water resources and their change since the 1870s. “Hydrology in mountainous regions,” International Association of Hydro logical SciencesPublication
193, 127–135.
5. Dyurgerov, M. B., and Meier, M. F. (2000). Twentieth century climate change: Evidence from small glaciers. Proceedings of the National Academy of Science
97, 1406–1411.