1. E-mail: jacobsow@uwgb.edu References Alley, R.B., 1993. In search of ice-stream sticky spots;R William;J. Glaciol
2. Origin of a washboard moraine of the Des Moines Lobe inferred from sediment properties;S Ankerstjerne;Geomorphology,2105
3. Icelandic glaciers;H Bj�rnsson;J�kull,2008
4. A theory of drumlin formation by subglacial sediment deformation;G S Boulton;Drumlin symposium,1987