Zeinab Akhavan Mona Esmaeili Dimitrios Sikeridis Michael Devetsikiotis Internet of Things-enabled Passive Contact Tracing in Smart Cities. 100397 2022 18 Internet Things https://doi.org/10.1016/j.iot.2021.100397 db/journals/iot/iot18.html#AkhavanESD22