Andrzej Czyzewski Marek Szczerba Bozena Kostek Musical Phrase Representation and Recognition by Means of Neural Networks and Rough Sets. 254-278 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3100&spage=254 2004 journals/trs/2004-1 T. Rough Sets db/journals/trs/trs1.html#CzyzewskiSK04