Stavreva, Natasha, and Natasha Tosheska Spasova. “MECHANICAL CHEMICAL AND OPTICAL CHARACTERSITICS OF ZIRCONIA CERAMICS FOR DENTAL RESTORATIONS”. KNOWLEDGE - International Journal , vol. 45, no. 7, Apr. 2021, pp. 1549-52, https://ikm.mk/ojs/index.php/kij/article/view/289.