sarwodidoyo, Sasito Edie, Novizal Novizal, and Khasanah Rahmawati. 2015. “Indirect Validity Test of Measurement Instrumentation in Flow Injection Synthesis Technique of Cu-Zn Ferrite Formation Process”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 24 (6):348-60. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/4919.