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		Murti, A., 		Manuaba, I., & 		Arjana, I.
(2020).
 OPTIMASI UNIT PLTU BERBAHAN BAKAR BATUBARA MENGGUNAKAN METODE LAGRANGE DI PT. INDONESIA POWER UP SURALAYA.
<em>Jurnal SPEKTRUM, 7</em>(1), 76-82.
doi:10.24843/SPEKTRUM.2020.v07.i01.p11