Albert Alexandrov Maximilian Ibel Klaus E. Schauser Chris J. Scheiman UFO: A Personal Global File System Based on User-Level Extensions to the Operating System. 207-233 1998 16 ACM Trans. Comput. Syst. 3 http://doi.acm.org/10.1145/290409.290410 db/journals/tocs/tocs16.html#AlexandrovISS98