Gong, Xinxin, and Bin Zhang. 2021. “Comparing Large-Unit and Bitwise Linear Approximations of SNOW 2.0 and SNOW 3G and Related Attacks”. IACR Transactions on Symmetric Cryptology 2021 (2):71-103. https://doi.org/10.46586/tosc.v2021.i2.71-103.