Karabalin, U., F. Serikov, O. Lyzlov, BachilovaТ., E. Yakupova, and A. Yeleukulova. 2011. “Influence of Processing of the Limestone-Coquina With Solutions of Polysulfide Calcium on Its Durability.”. Chemical Bulletin of Kazakh National University 61 (1), 66-70. https://chemistry.kz/bulletin/index.php/kaznu/article/view/850.