Vijay B. Krishna Curtis R. Cook Daniel Keller Joshua Cantrell Chris S. Wallace Margaret M. Burnett Gregg Rothermel Incorporating Incremental Validation and Impact Analysis into Spreadsheet Maintenance: An Empirical Study. 72-81 2001 ICSM http://computer.org/proceedings/icsm/1189/11890072abs.htm db/conf/icsm/icsm2001.html#KrishnaCKCWBR01