Li, S., S. Sun, D. Shi, C. Li, and L. Hu. “Lightweight Iterative MDS Matrices: How Small Can We Go?”. IACR Transactions on Symmetric Cryptology, vol. 2019, no. 4, Jan. 2020, pp. 147-70, doi:10.13154/tosc.v2019.i4.147-170.