5Upadek H and Krings P. Development and performance of zeolite - A - built non - phosphate detergents. In Zeolites as catalysts, sorbents and detergent builders. Amsterdam:Elsevier Science Publishers[ M ], 1989,701-709.
6Yamane 1 and Nakazawa T. Development of zeolite for non - phospha- ted detergents in Japan. In:Zeolite as catalysts, Sorbents and deter- gent builder. Amsterdam : Elsevier Science Publishers[ J] , 1989,991-992.
7Murat. Synthesis of zeolites from thermally activated kaolinite, some observation on nucleation and growth [ J ]. Clay Minerals, 1992, 27 : 119-130.
