Chung, Chi-Ming Marvin, et al. “NTT Multiplication for NTT-Unfriendly Rings: New Speed Records for Saber and NTRU on Cortex-M4 and AVX2”. IACR Transactions on Cryptographic Hardware and Embedded Systems, vol. 2021, no. 2, Feb. 2021, pp. 159-88, doi:10.46586/tches.v2021.i2.159-188.