Neve
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http://www.cai-svi.it/j15/index.php?option=com_weblinks&view=category&id=3&Itemid=21
Valanghe
http://www.scialp.it/valanghe/valanghe.htm
http://www.scialp.it/valanghe/tecnica/rutschblock.pdf
http://www.usariem.army.mil/pages/download/harshenvironmentsvol1.pdf
https://www.princeton.edu/~oa/winter/index.shtml