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Dewi, R.; Krisman, K.; Zulkarnaen, Z.; Syahraini, R. A. .; Husein, T. L. . THE DETERMINATION OF BARIUM STRONTIUM TITANATE THIN FILM BAND GAP ENERGY Ba0,15Sr0,85TiO3 USING ULTRAVIOLET-VISIBLE SPECTROSCOPY. SPEKTRA 2020, 5, 11-20.