Miguel Ribeiro, Nuno Jardim Nunes, Valentina Nisi, Johannes Schöning, Marta Ferreira, João Nogueira: Addressing the Challenges of COVID-19 Social Distancing Through Passive Wi-Fi and Ubiquitous Analytics: A Real-World Deployment. Interact 2021: Proceedings of the International Conference on Human-Computer Interaction, (2021)