1. Belady C, Rawson A, Pfleuger D, Cader T. Green Grid Data Center Power Efficiency Metrics: PUE and DCiE, The Green Grid, White Paper No. 6, 2008.
2. ISO. 2016. Information Technology - Data Centres - Key Performance Indicators - Part 2: Power Usage Effectiveness (PUE), https://www.iso.org/standard/63451.html.
3. ISO. 2017. Information Technology - Data Centres - Key Performance Indicators - Part 4: IT Equipment Energy Efficiency for servers (ITEEsv), https://www.iso.org/standard/66191.html.
4. ISO. 2017. Information Technology - Data Centres - Key Performance Indicators - Part 5: IT Equipment Utilization for servers (ITEUsv), https://www.iso.org/standard/66934.html.
5. Ascierto R, Lawrence A. Uptime Institute global data center survey 2020, Uptime Institute Intelligence Report 38, Seattle, 2020.