PEI, Xiaoshuai; MENG, Chao; LI, Minzan; YANG, Wei; ZHOU, Peng. Measurement of soil electrical conductivity based on direct digital synthesizer (DDS) and digital oscilloscope. International Journal of Agricultural and Biological Engineering, [S. l.], v. 12, n. 6, p. 162–168, 2019. Disponível em: https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/4840. Acesso em: 26 dec. 2025.