Banik, S., T. Isobe, F. Liu, K. Minematsu, and K. Sakamoto. “Orthros: A Low-Latency PRF”. IACR Transactions on Symmetric Cryptology, Vol. 2021, no. 1, Mar. 2021, pp. 37-77, doi:10.46586/tosc.v2021.i1.37-77.