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Adina E. Racoviteanu; William F. Manley; Yves Arnaud; Mark W. Williams. (2007). Evaluating digital elevation models for glaciologic applications: An example from Nevado Coropuna, Peruvian Andes. , 59(1-4), 0–125. doi:10.1016/j.gloplacha.2006.11.036 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research