@article{afp,
	Author = {Anders Schlichtkrull},
	Issn = {2150-914x},
	Journal = {Archive of Formal Proofs},
	Month = jun,
	Note = {\url{http://isa-afp.org/entries/Resolution_FOL.shtml}, Formal proof development},
	Title = {The Resolution Calculus for First-Order Logic},
	Year = 2016}

@url{isafor,
	Author = {Sternagel, Christian and Thiemann, Ren{\'e}},
	Howpublished = {\url{http://cl-informatik.uibk.ac.at/software/ceta/}},
	Title = {An {Isabelle/HOL} formalization of rewriting for certified termination analysis}}
