Paul Crowley, "Truncated differential cryptanalysis of five rounds of Salsa20", pdf, submitted 2005-12-25. (An error in the paper was reported in the forum.)
Simon Fischer, Willi Meier, C�me Berbain, Jean-Fran�ois Biasse, Matthew J. B. Robshaw, "Non-randomness in eSTREAM Candidates Salsa20 and TSC-4." Progress in Cryptology - INDOCRYPT 2006, LNCS 4329, pp. 2-16.
Yukiyasu Tsunoo, Teruo Saito, Hiroyasu Kubo, Tomoyasu Suzaki and Hiroki Nakashima, "Differential Cryptanalysis of Salsa20/8", pdf, submitted 2007-01-02.
