Studies on the Isothemal Solubilities of the Quaternary System KCl-K2SO4-CO(NH2)2-H2O at 25℃
ZHANG Feng-Xing, WEI Xiao-Lan, ZHOU Xia, GUO Zhi-Zhen
Chem. J. Chinese Universities . 1997, (4): 605 -608 .