Elisavet Konstantinou Vasiliki Liagkou Paul G. Spirakis Yannis C. Stamatiou Moti Yung Electronic National Lotteries. 147-163 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3110&spage=147 2004 conf/fc/2004 Financial Cryptography db/conf/fc/fc2004.html#KonstantinouLSSY04