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Popp, Trevor J.; Hansen, Steffen B.; Sheldon, Simon G.; Schwander, Jakob; Johnson, Jay A. (2014). Drilling into debris-rich basal ice at the bottom of the NEEM (Greenland) borehole. Annals of glaciology, 55(68), pp. 199-206. International Glaciological Society 10.3189/2014AoG68A029
Johnsen, Sigfús J.; Hansen, Steffen Bo; Sheldon, Simon G.; Dahl-Jensen, Dorthe; Steffensen, Jørgen P.; Augustin, Laurent; Journé, Paul; Alemany, Olivier; Rufli, Henry; Schwander, Jakob; Azuma, Nobuhiko; Motoyama, Hideaki; Popp, Trevor; Talalay, Pavel; Thorsteinsson, Thorsteinn; Wilhelms, Frank; Zagorodnov, Victor (2007). The Hans Tausen drill: design, performance, further developments and some lessons learned. Annals of glaciology, 47, pp. 89-98. International Glaciological Society 10.3189/172756407786857686
