Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Sakamoto Yoshifumi and Kanamori Junjiro,Phase Diagram of the Lattice Gas Model for the (111) Surfaces of Si and Ge —A Hard Hexagon Model with Extended Range Interactions—,Journal of the Physical Society of Japan,00319015,THE PHYSICAL SOCIETY OF JAPAN,1989,58,6,2083-2091,https://cir.nii.ac.jp/crid/1390282679162417280,https://doi.org/10.1143/jpsj.58.2083