Perrin, L., & Udovenko, A. (2017). Exponential S-Boxes: a Link Between the S-Boxes of BelT and Kuznyechik/Streebog. IACR Transactions on Symmetric Cryptology, 2016(2), 99-124. https://doi.org/10.13154/tosc.v2016.i2.99-124