3Lahalih, Shawqui M, Absi-Halabi, et al. Utilization of melamine waste effluent[P]. US:4797433,1989.
4Lahalih, Shawqui M, Absi-Halabi M. Recovery of solids from melamine waste effluents and their conversion to useful products[J]. Ind. Eng. Chem. Res., 1989,28(4):500-504.
5Friedrich Dipl-Ing Dr Lunzer, Alfred Dipl-Ing Garber. Process of the preparation for pure cyanuric acid[P].EP:0124710,1984.
6Mason R W, Parker T C. Purification of cyanuric acid[P]. US:4963674,1990.