Eli Biham, Vladimir Furman. Improved Impossible Differentials on Twofish. In Bimal K. Roy, Eiji Okamoto, editors, Progress in Cryptology - INDOCRYPT 2000, First International Conference in Cryptology in India, Calcutta, India, December 10-13, 2000, Proceedings. Volume 1977 of Lecture Notes in Computer Science, pages 80-92, Springer, 2000. [doi]
Abstract is missing.