Deawsurintr, Somsak, Warawutti Lohawijarn, and Chalamp Prompat. 2013. “Design and Construction of a Geo-electric Node System for Earth Resistivity Meters”. Engineering and Applied Science Research 30 (3):201-13. https://ph01.tci-thaijo.org/index.php/easr/article/view/6583.