Chemical states of GeTe thin-film during structural phase-change by annealing in ultra-high vacuumC. Ko, Y. M. Lee, H. J. Shin, M.-C. Jung, M. Han, K. Kim, J. C. Park, S. A. Song and H. S. JeongEur. Phys. J. B, 66 2 (2008) 171-174DOI: https://doi.org/10.1140/epjb/e2008-00400-x