What are some examples of recovery blocks and N-version software mentioned in the blog post?
http://crystal.uta.edu/~kumar/cse6306/papers/FaultTolerantDi...
http://roc.cs.berkeley.edu/papers/ROC_TR02-1175.pdf
http://www.pld.ttu.ee/IAF0030/Paper_4.pdf
http://sirocco2016.hiit.fi/preproceedings/Recent_Results_on_...