Biljana Cubaleska Andreas Rieke Thomas Hermann Improving and Extending the Lim/Lee Exponentiation Algorithm. 163-174 http://link.springer.de/link/service/series/0558/bibs/1758/17580163.htm 1999 conf/sacrypt/1999 Selected Areas in Cryptography db/conf/sacrypt/sacrypt1999.html#CubaleskaRH99