Sherman S. M. Chow Joseph K. Liu Duncan S. Wong Robust Receipt-Free Election System with Ballot Secrecy and Verifiability. 2008 NDSS http://www.isoc.org/isoc/conferences/ndss/08/papers/05_robust_receipt-free.pdf conf/ndss/2008 db/conf/ndss/ndss2008.html#ChowLW08