...Mullender
University of Twente, Faculty of Computer Science, P.O. Box 217, 7500 AE Enschede, The Netherlands
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...Leslie
Cambridge University Computer Laboratory, Corn Exchange Street, Cambridge CB2 3QG, United Kingdom
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...size=-1>SPRIT
The Pegasus Project is supported by ESPRIT BRA project 6586 and partially supported by the Cambridge Olivetti Research Laboratory and a grant from Digital Equipment Corporation.

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...modify
Yes, even Mach 3.0.

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...Cleaning
Cleaning in a log-structured filing system is the act of recovering space which holds out of date information. Information may become out of date either because a later copy has been written or it has been logically deleted.
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Sape J. Mullender, Ian M. Leslie and Derek McAuley