Zuzana Beerliová-Trubíniová Martin Hirt Micha Riser Efficient Byzantine Agreement with Faulty Minority. 393-409 2007 ASIACRYPT http://dx.doi.org/10.1007/978-3-540-76900-2_24 db/conf/asiacrypt/asiacrypt2007.html#Beerliova-TrubiniovaHR07