Francisco-Jesús Martín-Mateos Julio Rubio José-Luis Ruiz-Reina ACL2 Verification of Simplicial Degeneracy Programs in the Kenzo System. 106-121 2009 Calculemus/MKM http://dx.doi.org/10.1007/978-3-642-02614-0_13 conf/mkm/2009 db/conf/mkm/mkm2009.html#Martin-MateosRR09