@book{2002-heydon ,note={URL: {\tt ftp://gatekeeper.research.compaq.com/pub/DEC/SRC/research-reports/SRC-177.pdf}. Note: Research Report 177 and see also newer version $0} ,title={{The Vesta software configuration management system}} ,booktitle={{The Vesta software configuration management system}} ,author={Allan Heydon and Roy Levin and Timothy Mann and Yuan Yu} ,publisher={Compaq Systems Research Center} ,year={2002} }