Pahtma, R., J. Preden, R. Agar, and P. Pikk. “Utilization of Received Signal Strength Indication by Embedded Nodes”. Elektronika ir Elektrotechnika 93, no. 5 (May 20, 2009): 39-42. Accessed September 30, 2020. https://eejournal.ktu.lt/index.php/elt/article/view/10177.