Kaljuvee, T., Kuusik, R., Veiderma, M. Physico-chemical transformations during thermal treatment of phosphorites and solubility of the products // Third International Symposium on Inorganic Phosphate Materials : Villeneuve d'Ascq, France, September 14-16, 1999 : book of abstracts. [S.l.], 1999. p. P.2.17. https://www.researchgate.net/publication/276322876_PHYSICO-CHEMICAL_TRANSFORMATIONS_DURING_THERMAL_TREATMENT_OF_PHOSPHORITES_AND_SOLUBILITY_OF_THE_PRODUCTS