Loerting, T., Schustereder, W., Winkel, K., Salzmann, C. G., Kohl, I., & Mayer, E. (2006). Amorphous Ice: Stepwise Formation of Very-High-Density Amorphous Ice from Low-Density Amorphous Ice at 125 K. Physical Review Letters, 96: 025702. doi:10.1103/PhysRevLett.96.025702.