A Type-theoretic Reconstruction of the Visitor Pattern.

Peter Buchlovsky Hayo Thielecke A Type-theoretic Reconstruction of the Visitor Pattern. 309-329 2006 155 Electr. Notes Theor. Comput. Sci. http://dx.doi.org/10.1016/j.entcs.2005.11.061 db/journals/entcs/entcs155.html#BuchlovskyT06