1. L.D. Akwilapo, K. Wiik, Ceramic properties of Pugu kaolin clays Part 2: effect of phase composition on flexural strength. Bull. Chem. Soc. Ethiop. 18, 7 (2004)
2. A. Yaya, E.K. Tiburu, M.E. Vickers, J.K. Efavi, B.O. Agyeman, K.M. Knowes, Characterization and identification of local kaolin clay from Ghana: a potential material for electro porcelain insulator fabrication. Appl. Clay Sci. 150, 125 (2017)
3. B. Ngayakamo, S.E. Park, Effect of firing temperature on triaxial electrical porcelain properties made from Tanzania locally sourced ceramic raw materials. J. Silic. Compos. Mater. 70, 106 (2018)
4. A. J. Al-Bermany F. SH. Hashim, E. D. Al-Bermany, Enhancement the mechanical properties of produced porcelain by a ceramic additives using ultrasonic technique, Chem. Mater. Reas. 2, 33 (2012)
5. T. Sui, K. Dragnevsk, T. Neo, A.Korsunsky, Mechanisms of failure in porcelain-veneered sintered zirconia restorations, in 13th International Conference on Fracture 2013, ICF 1, 416 (2013)