Song, Ling, Xianrui Qin, and Lei Hu. “Boomerang Connectivity Table Revisited. Application to SKINNY and AES”. IACR Transactions on Symmetric Cryptology 2019, no. 1 (March 8, 2019): 118–141. Accessed June 25, 2022. https://tosc.iacr.org/index.php/ToSC/article/view/7399.