ARFEEN, Ibrahim Elkhier Hussien.
 Electronic Circuit Design for Hydrogen Ion Measurement System.
<strong>Gezira Journal of Engineering and Applied Sciences</strong>, [S.l.], v. 7, n. 2, july 2018.
ISSN 1858-5698. Available at: &lt;<a href="http://journals.uofg.edu.sd/index.php/gjeas/article/view/554" target="_new">http://journals.uofg.edu.sd/index.php/gjeas/article/view/554</a>&gt;. Date accessed: 30 june 2026.