1. T. Siegenthaler, “Decrypting a Class of Stream Ciphers Using Ciphertext Only”, IEEE Trans. on Computers, Vol. C-33, 1984.
2. T. Siegenthaler, “Correlation-Immunity of Nonlinear Combining Functions for Cryptographic Applications”, IEEE Trans. on Info. Th., Vol. IT-31, 1985.
3. Xiao Guo-zhen, J.L. Massey, “A Spectral Characterization of Correlation-Immune Combining Functions”, submitted to IEEE Trans. on Info. Th.
4. V.S. Pless, “Encryption Schemes for Computer Confidentiality”, IEEE Trans. on Computers, Vol. C-26, Nov. 1977.
5. T. Siegenthaler, “Design of Combiners to Prevent Divide and Conquer Attacks”, Proceedings of Crypto 85, Santa Barbara, August 18–22, 1985.