Ai , Songtao, Zemin Wang, Dongchen E, Kim Holmén, Zhi Tan, Chunxia Zhou, and Weijun Sun. 2014. “Topography, Ice Thickness and Ice Volume of the Glacier Pedersenbreen in Svalbard, Using GPR and GPS”. Polar Research 33 (February). https://doi.org/10.3402/polar.v33.18533.