% Generated by IEEEtran.bst, version: 1.14 (2015/08/26)
\begin{thebibliography}{1}
\providecommand{\url}[1]{#1}
\csname url@samestyle\endcsname
\providecommand{\newblock}{\relax}
\providecommand{\bibinfo}[2]{#2}
\providecommand{\BIBentrySTDinterwordspacing}{\spaceskip=0pt\relax}
\providecommand{\BIBentryALTinterwordstretchfactor}{4}
\providecommand{\BIBentryALTinterwordspacing}{\spaceskip=\fontdimen2\font plus
\BIBentryALTinterwordstretchfactor\fontdimen3\font minus
  \fontdimen4\font\relax}
\providecommand{\BIBforeignlanguage}[2]{{%
\expandafter\ifx\csname l@#1\endcsname\relax
\typeout{** WARNING: IEEEtran.bst: No hyphenation pattern has been}%
\typeout{** loaded for the language `#1'. Using the pattern for}%
\typeout{** the default language instead.}%
\else
\language=\csname l@#1\endcsname
\fi
#2}}
\providecommand{\BIBdecl}{\relax}
\BIBdecl

\bibitem{Vardi_Wolper_1986}
\BIBentryALTinterwordspacing
M.~Y. Vardi and P.~Wolper, ``\BIBforeignlanguage{English}{An automata-theoretic
  approach to automatic program verification}.''\hskip 1em plus 0.5em minus
  0.4em\relax IEEE Computer Society, 1986. [Online]. Available:
  \url{https://orbi.uliege.be/handle/2268/116609}
\BIBentrySTDinterwordspacing

\bibitem{clarke2000model}
E.~M. Clarke, O.~Grumberg, and D.~A. Peled, \emph{Model Checking}.\hskip 1em
  plus 0.5em minus 0.4em\relax Cambridge, MA: MIT Press, 2000.

\bibitem{Kozen_1977}
\BIBentryALTinterwordspacing
D.~Kozen, ``\BIBforeignlanguage{en}{Lower bounds for natural proof systems},''
  in \emph{\BIBforeignlanguage{en}{18th Annual Symposium on Foundations of
  Computer Science (sfcs 1977)}}.\hskip 1em plus 0.5em minus 0.4em\relax
  Providence, RI, USA: IEEE, Sep. 1977, p. 254–266. [Online]. Available:
  \url{http://ieeexplore.ieee.org/document/4567949/}
\BIBentrySTDinterwordspacing

\end{thebibliography}
