A good introduction to the model and it's implementation is published as a paper in Computers and Geosciences. Please also quote this paper whenever you publish work which uses Icetools.

Jarosch A. H., 2008: Icetools: a Full Stokes Finite Element Model for Glaciers. Computers & Geosciences, 34/8, doi:10.1016/j.cageo.2007.06.012