Secure open federation of IoT platforms through interledger technologies-the SOFIE approach - Dmitrij Lagutin; Francesco Bellesini; Tommaso Bragatto; Alessio Cavadenti; Vincenzo Croce; Yki Kortesniemi; Helen C. Leligou; Yannis Oikonomidis; George C. Polyzos; Giuseppe Raveduto; others (2019 European Conference on Networks and Communications (EuCNC), 2019)