Li, S., S. Sun, C. Li, Z. Wei, and L. Hu. “Constructing Low-Latency Involutory MDS Matrices With Lightweight Circuits”. IACR Transactions on Symmetric Cryptology, vol. 2019, no. 1, Mar. 2019, pp. 84-117, doi:10.13154/tosc.v2019.i1.84-117.