Maria M. Larrondo-Petrie Jack Bresenham Cary Laxer John Lansdown G. Scott Owen Approaches to teaching introductory computer graphics. 479-480 1994 conf/siggraph/1994 SIGGRAPH http://doi.acm.org/10.1145/192161.192290 db/conf/siggraph/siggraph1994.html#Larrondo-PetrieBLLO94