NB-IoT for environmental monitoring and a fire early warning detection system in Mount Pentelicus. - Trigkas, Athanasios; Sarigiannis, Georgios; Daousis, Spyridon; Papageorgas, Panagiotis; Agavanakis, Kyriakos; Panagiotopoulos, Konstantinos (AIP Conference Proceedings, 2022)