Zhai, Wei. “Design of NarrowBand-IoT Oriented Wireless Sensor Network in Urban Smart Parking”. International Journal of Online and Biomedical Engineering (iJOE) 13, no. 12 (December 11, 2017): pp. 116–126. Accessed April 27, 2024. https://online-journals.org/index.php/i-joe/article/view/7886.