Berli, A. U., Dahlan, D., & Umar, A. A. (2017). Pengaruh Lama Penumbuhan Titanium Dioksida Didoping Copper Terhadap Energi Gap. JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS, 8(2), 60–63. https://doi.org/10.25077/jif.8.2.60-63.2016