Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Hiroshi Nakazato and Mao-Ting Chien,Circumscribed sphere of a convex polyhedron,Applied Mathematics Letters,0893-9659,Elsevier BV,2005-11-01,18,,1199-1203,https://cir.nii.ac.jp/crid/1871428067451645312,https://doi.org/10.1016/j.aml.2005.02.008