yes as I said we reached out to them.
here are some much older articles
Birman, Kenneth; Thomas Joseph (1987). "Exploiting virtual synchrony in distributed systems"http://portal.acm.org/citation.cfm?id=37515&dl=ACM&coll=GUIDE
Schneider, Fred (1990). "Implementing Fault-Tolerant Services Using the State Machine Approach: A Tutorial"http://ecommons.library.cornell.edu/bitstream/1813/6640/2/86-800.ps

this is the newer one you requested a link to. Scalable and leaderless Byzantine consensus in cloud computing environments https://link.springer.com/article/10.1007/s10796-013-9460-7