Situmeang, R., Manurung, P., Try Sulistiyo, S., Hadi, S., Simanjuntak, W., & Sembiring, S. (2015). Sol-Gel Method for Preparation of Nanosize NiFe2-xCoxO4 Using Egg White. Asian Journal of Chemistry, 27(3), 1138–1142. https://doi.org/10.14233/ajchem.2015.18641