SELVAM, K. C. A Circuit for the Square Root of the Sum of Two Squared Voltages using an IC LM311 Open Collector Comparator. Engineering, Technology & Applied Science Research, Greece, v. 3, n. 6, p. 549–551, 2013. DOI: 10.48084/etasr.241. Disponível em: https://www.etasr.com/index.php/ETASR/article/view/241. Acesso em: 22 jan. 2022.