Yanhua Mao Flavio Paiva Junqueira Keith Marzullo Mencius: Building Efficient Replicated State Machine for WANs. 369-384 2008 OSDI http://www.usenix.org/events/osdi08/tech/full_papers/mao/mao.pdf conf/osdi/2008 db/conf/osdi/osdi2008.html#MaoJM08