Piotr Kosiuczenko Proof Transformation via Interpretation Functions: Results, Problems and Applications. 139-145 2005 127 Electr. Notes Theor. Comput. Sci. 3 http://dx.doi.org/10.1016/j.entcs.2004.08.040 db/journals/entcs/entcs127.html#Kosiuczenko05