The Packing of Helical and Zigzag Chains and Distribution of Interstitial Voids in Expanded Liquid Se near the Semiconductor to Metal TransitionKenji Maruyama, Satoshi Hiroi (Sato), Hirohisa Endo, Hideoki Hoshino, Takashi Odagaki and Friedrich HenselEPJ Web Conf., 151 (2017) 01003DOI: https://doi.org/10.1051/epjconf/201715101003