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Choirul, Amri (2005) DETERMINATION OF NITRITE AS 4-(4-NITROBENZENAZO)-1-AMINONAPHTHALENE DYE USING OPTICAL MEMBRANES BASED ON PVC-DOS MATRIX. Indo. J. Chem, 5 (3). pp. 269-273.
Choirul, Amri (2005) DETERMINATION OF NITRITE AS 4-(4-NITROBENZENAZO)-1-AMINONAPHTHALENE DYE USING OPTICAL MEMBRANES BASED ON PVC-DOS MATRIX. Indonesian Journal of Chemistry, 5 (3). pp. 269-273.
Choirul, Amri (2005) Metode penentuan nitrit sebagai kompleks 4-(4-Nitrobenzenazo)-1-Aminonaftalen secara ekstraksi spektrofotometri dan membran optik berbasis PVC-DO. Masters thesis, Universitas Gadjah Mada.