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R. A. Shahmiri and  O. C. Standard and  J. N. Hart and  C. C. Sorrell,  A Review of the Characteristics and Optimization of Optical Properties of Zirconia Ceramics for Aesthetic Dental Restorations.   journal   = {International Journal of Medical, Health, Biomedical, Bioengineering and Pharmaceutical Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2017, vol. 128(8). 499 - 507[viewed 25 June 2018]. Available from: http://waset.org/publications/10008251.