Monitoring Social Distancing in Smart Spaces using Infrastructure-Based Sensors. - Naser Hossein Motlagh; Pupu Toivonen; Martha Arbayani Zaidan; Eemil Lagerspetz; Ella Peltonen; Ekaterina Gilman; Petteri Nurmi; Sasu Tarkoma (WF-IoT, 2021)

Chirp-Loc: Multi-factor authentication via acoustically-generated location signatures. - Prakash Shrestha; Hien Thi Thu Truong; Pupu Toivonen; Nitesh Saxena; Sasu Tarkoma; Petteri Nurmi (Pervasive Mob. Comput., 2023)