https://www.htx.gov.sg/news/media-release-htx-ground-robot-on-trial-at-toa-payoh-central-to-support-public-officers-in-enhancing-public-health-and-safety
https://nyadagbladet.se/it-overvakning/robotar-ska-overvaka-medborgarna-i-singapore/attachment/xavier-robot-singapore/
https://www.htx.gov.sg/news/media-release-htx-ground-robot-on-trial-at-toa-payoh-central-to-support-public-officers-in-enhancing-public-health-and-safety