Motswakae, T. ., S. . M. Sheikh, and I. . M. Ngebani. “Low-Cost Long Range IoT Communication Systems for Smart Farming Applications in Developing Countries”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 73, no. 1, Oct. 2020, pp. 186-99, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/6331.