Jason Alexander Andy Cockburn Stephen Fitchett Carl Gutwin Saul Greenberg Revisiting read wear: analysis, design, and evaluation of a footprints scrollbar. 1665-1674 2009 CHI http://doi.acm.org/10.1145/1518701.1518957 conf/chi/2009 db/conf/chi/chi2009.html#AlexanderCFGG09