@book{LNCS2283,author={Tobias Nipkow and Lawrence Paulson and Markus Wenzel},
title="Isabelle/HOL --- A Proof Assistant for Higher-Order Logic",
publisher=Springer,series=LNCS,volume=2283,year=2002,
note={\url{http://www.in.tum.de/~nipkow/LNCS2283/}}}

@misc{ThreeDivides,
  author = {Benjamin Porter},
  title = {ThreeDivides},
  howpublished = {\url{https://isabelle.in.tum.de/dist/library/HOL/HOL-ex/ThreeDivides.html}},
  year = {2005},
  note = {Accessed: 2023-03-06}
}