Physico-chemical transformations during thermal treatment of phosphorites and solubility of the productsKaljuvee, Tiit; Kuusik, Rein, keemik; Veiderma, MihkelPhosphorus research bulletin1999 / Special issue: Proceedings of the Third International Symposium on Inorganic Phosphate Materials '99 : Villeneuve d'Ascq, France, September 14-16, 1999, p. 335-340: ill Physico-chemical transformations during thermal treatment of phosphorites and solubility of the productsKaljuvee, Tiit; Kuusik, Rein, keemik; Veiderma, MihkelThird International Symposium on Inorganic Phosphate Materials : Villeneuve d'Ascq, France, September 14-16, 1999 : book of abstracts1999 / p. P.2.17