RonPub UG (haftungsbeschränkt) http://www.ronpub.com Haifeng Chen Kevin Woodward Lu-An Tang Moto Sato Peng Yuan 3D Histogram Based Anomaly Detection for Categorical Sensor Data in Internet of Things 32-43 2022 Open Journal of Internet Of Things (OJIOT) 8 8 https://www.ronpub.com/ojiot/OJIOT_2022v8i1n04_Yuan.html https://www.ronpub.com/OJIOT_2022v8i1n04_Yuan.pdf