Koji Nuida Satoshi Fujitsu Manabu Hagiwara Takashi Kitagawa Hajime Watanabe Kazuto Ogawa Hideki Imai An Improvement of Tardos's Collusion-Secure Fingerprinting Codes with Very Short Lengths. 80-89 2007 conf/aaecc/2007 AAECC http://dx.doi.org/10.1007/978-3-540-77224-8_12 db/conf/aaecc/aaecc2007.html#NuidaFHKWOI07