Guo, C., F.-X. Standaert, W. Wang, X. Wang, and Y. Yu. “Provable Security of SP Networks With Partial Non-Linear Layers”. IACR Transactions on Symmetric Cryptology, Vol. 2021, no. 2, June 2021, pp. 353-88, doi:10.46586/tosc.v2021.i2.353-388.