Jovan Dj. Golic Mahmoud Salmasizadeh Ed Dawson Fast Correlation Attacks on the Summation Generator. 245-262 2000 13 J. Cryptology 2 http://link.springer.de/link/service/journals/00145/bibs/0013002/00130245.html db/journals/joc/joc13.html#GolicSD00