Yang, B., V. Rožic, M. Grujic, N. Mentens, and I. Verbauwhede. “ES-TRNG: A High-Throughput, Low-Area True Random Number Generator Based on Edge Sampling”. IACR Transactions on Cryptographic Hardware and Embedded Systems, vol. 2018, no. 3, Aug. 2018, pp. 267-92, doi:10.13154/tches.v2018.i3.267-292.