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Gautam, A., Verma, G., Qamar, S., & Shekhar, S. (2019). Vehicle Pollution Monitoring, Control and Challan System Using MQ2 Sensor Based on Internet of Things. Wireless Personal Communications. doi:10.1007/s11277-019-06936-4 
10.1007/s11277-019-06936-4
downloaded on 2019-11-22