Grassi, Lorenzo, Christian Rechberger, and Sondre Rønjom. “Subspace Trail Cryptanalysis and Its Applications to AES”. IACR Transactions on Symmetric Cryptology 2016, no. 2 (February 3, 2017): 192-225. Accessed April 6, 2020. https://tosc.iacr.org/index.php/ToSC/article/view/571.