Nathan Edwards Ross Lippert Sequence Database Compression for Peptide Identification from Tandem Mass Spectra. 230-241 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3240&spage=230 2004 conf/wabi/2004 WABI db/conf/wabi/wabi2004.html#EdwardsL04