Simultaneous Analysis of Dopamine and Ascorbic Acid Using Polymelamine/Gold Nanoparticle-Modified Carbon Paste Electrode oleh Muji Harsini, Ainy Nur Farida, Erna Fitriany, Denok Risky Ayu Paramita, Afaf Baktir, Fredy Kurniawan, Satya Candra Wibawa Sakti, Yudhi Dwi Kurniawan, Bernadeta Ayu Widyaningrum