Solid-liquid equilibria of the CO(NH 2 ) 2 -MgSO 4 -(NH 4 ) 2 SO 4 -H 2 O system at 0 °C and 25 °C Zhao, B.; Wang, S.; Zhang, L.; Wang, X.f.; Liu, Q.l.; Cao, J.l.; Fluid Phase Equilibria 2017, 446, 9-13