Hikmah, Fajrin, 		Mulyono, Tri, AND 		Zulfikar, Zulfikar.
" Simultaneous Analysis of Ammonium and Nitrate Ions Levels with Potentiometric Multi-commutation Flow System Method" <em>Jurnal ILMU DASAR</em> [Online], Volume 22 Number 1 (19 January 2021)