1. Agile Sub-Ice Geological (ASIG) drill (n.d.) U.S. ice drilling program. Available at:
http://www.icedrill.org/equipment/agile-sub-ice-geological-drill.shtml
. Accessed 24 May 2015
2. Antarctic Photo Library (n.d.) United States Antarctic program. Available at:
http://photolibrary.usap.gov/
. Accessed 17 Nov 2014
3. Arenson LU (2002) Unstable alpine permafrost: a potentially important natural hazard. PhD. Institute for Geotechnical Engineering, Swiss Federal Institute of Technology ETH Zurich
4. Auger Torque Australia Pty Ltd. (2013) Product guide, vol 10. Brisbane, Australia
5. Barsch D, Fierz H, Haeberli W (1979) Shallow core drilling and borehole measurements in permafrost of an active rock glacier near the Grubengletscher, Wallis. Swiss Alps Arctic Alpine Res 11:215–228