Neger, A. T., S. Parvin, A. Ahmed, and A. S. Alam. “Studies on Black Iron Oxide Pigment. Part I: Effect of Preparation Parameter on Physical and Optical Properties of Ferrosoferric Oxide”. Bangladesh Journal of Scientific and Industrial Research, vol. 43, no. 2, July 2008, pp. 183-96, doi:10.3329/bjsir.v43i2.962.