Annalisa De Bonis Leszek Gasieniec Ugo Vaccaro Generalized Framework for Selectors with Applications in Optimal Group Testing. 81-96 2003 conf/icalp/2003 ICALP http://link.springer.de/link/service/series/0558/bibs/2719/27190081.htm db/conf/icalp/icalp2003.html#BonisGV03