@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/}}}

@book{harrison1997floating,
  title={Floating point verification in HOL light: the exponential function},
  author={Harrison, John},
  year={1997},
  publisher={Springer}
}
