Edward D. Willink Philip J. Harris The Side Transformation Pattern: Making Transforms Modular and Re-usable. 17-29 2005 127 Electr. Notes Theor. Comput. Sci. 3 http://dx.doi.org/10.1016/j.entcs.2004.08.030 db/journals/entcs/entcs127.html#WillinkH05