Silver is the intermediate verification language of the
Viper project <http://www.pm.inf.ethz.ch/research/viper.html>
by
Programming Methodology Group <http://www.pm.inf.ethz.ch/>
at the Department of Computer Science, ETH Zurich.
Instructions for how to get started with Viper can be found here. <http://www.pm.inf.ethz.ch/research/viper/downloads.html>
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Files for LaTeX and various editors can be found under
silver/util/highlighting
directory.