Eli Biham Michel Boyer Gilles Brassard Jeroen van de Graaf Tal Mor Security of Quantum Key Distribution against All Collective Attacks. 372-388 2002 34 Algorithmica 4 http://dx.doi.org/10.1007/s00453-002-0973-6 db/journals/algorithmica/algorithmica34.html#BihamBBGM02