1. J. Feinman and D.R. MacRae, eds.: Direct Reduced Iron: Technology and Economics of Production and Use, Iron and Steel Society of AIME, Warrendale, PA, 1999.
2. ISO 4700: Iron ore pellets for blast furnace and direct reduction feedstocks - Determination of the crushing strength, 2015.
3. 2018 World Direct Reduction Statistics, Midrex, Charlotte, NC, 2019, pp. 2.
4. C.Y. Xu, A.Y. Zheng, J.L. Zhang, R.R. Wang, Y. Li, Y.Z. Wang, and Z.J. Liu: in 10th International Symposium on High-Temperature Metallurgical Processing, T. Jiang, J.-Y. Hwang, D. Gregurek, Z. Peng, J.P. Downey, B. Zhao, O. Yücel, E. Keskinkilic, and R. Padilla, eds., Springer, Cham, 2019, pp. 631–47.
5. C.L. Nassaralla: in Encyclopedia of Materials: Science and Technology, K.H.J. Buschow, R.W. Cahn, M.C. Flemings, B. Ilschner, E.J. Kramer, S. Mahajan, and P. Veyssière, eds., Elsevier, Oxford, 2001, pp. 4296–301.