Lucie Vodova and  Radomir Sokolar and  Jitka Hroudova,  The Effect of CaO Addition on Mechanical Properties of Ceramic Tiles.   journal   = {International Journal of Civil and Environmental Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2014, vol. 90(6). 717 - 720
    [viewed 16 October 2021]. Available from: https://publications.waset.org/pdf/9998505.