Matthias Baaz Stefan Hetzl Alexander Leitsch Clemens Richter Hendrik Spohr CERES: An analysis of Fürstenberg's proof of the infinity of primes. 160-175 2008 403 Theor. Comput. Sci. 2-3 http://dx.doi.org/10.1016/j.tcs.2008.02.043 db/journals/tcs/tcs403.html#BaazHLRS08