Skippy: Enabling Long-Lived Snapshots of the Long-Lived Past. - Ross Shaull; Liuba Shrira; Hao Xu (ICDE, 2008)

Skippy: a new snapshot indexing method for time travel in the storage manager. - Ross Shaull; Liuba Shrira; Hao Xu (SIGMOD Conference, 2008)

A Modular and Efficient Past State System for Berkeley DB. - Ross Shaull; Liuba Shrira; Barbara Liskov (USENIX ATC, 2014)