S. Purushothaman Iyer David Hislop Paul L. Jones Jaime Lee Frederick Pearce Stephen Van Albert Introductory paper. 299-300 2004 5 STTT 4 http://www.springerlink.com/index/10.1007/s10009-003-0131-8 db/journals/sttt/sttt5.html#IyerHJLPA04