@article {76, title = {{Using surface velocities to calculate ice thickness and bed topography: a case study at Columbia Glacier, Alaska, USA}}, journal = {Journal of Glaciology}, volume = {58}, year = {2012}, pages = {1151-1164}, doi = {10.3189/2012JoG11J249}, author = {R ~W McNabb and Regine Hock and Shad O'Neel and L ~A Rasmussen and Ahn, Y. and M Braun and H Conway and Herreid, S. and Ian Joughin and W. Tad Pfeffer and B ~E Smith and Martin Truffer} }