Media type: E-Article Title: On the Optimal Number of Reflecting Elements for Reconfigurable Intelligent Surfaces Contributor: Zappone, Alessio; Di Renzo, Marco; Xi, Xiaojun; Debbah, Merouane imprint: Institute of Electrical and Electronics Engineers (IEEE), 2021 Published in: IEEE Wireless Communications Letters Language: Not determined DOI: 10.1109/lwc.2020.3034686 ISSN: 2162-2337; 2162-2345 Origination: Footnote: