Hikmah, F., 		Mulyono, T., & 		Zulfikar, Z.
(2021).
 Simultaneous Analysis of Ammonium and Nitrate Ions Levels with Potentiometric Multi-commutation Flow System Method.
<em>Jurnal ILMU DASAR, 22</em>(1), 69-74.
doi:10.19184/jid.v22i1.17767