RNFS - A Highly Available Network File Service. K. Birman with S. Armstrong et. al. Workshop on Workstation Operation Systems, Boston, Massachusetts, November 1987.

It's about building a clustered NFS server on "virtual synchrony", which is another replicated state machine scheme like paxos and raft. The paper really focuses on some of the issues in making the system very fine grained versus previous virtual synchrony implementations, in addition to the issues in general to making a clustered, highly available, multi master NFS server.