Stefan Berghofer Martin Strecker Extracting a formally verified, fully executable compiler from a proof assistant. 2003 82 Electr. Notes Theor. Comput. Sci. 2 http://www1.elsevier.com/gej-ng/31/29/23/133/53/show/Products/notes/index.htt#006 db/journals/entcs/entcs82.html#BerghoferS03