Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Vadim Shapiro and Alexander Pasko,Heterogeneous object models and their applications,Computer-Aided Design,0010-4485,Elsevier BV,2005-03-01,37,,285,https://cir.nii.ac.jp/crid/1873398392531974528,https://doi.org/10.1016/j.cad.2004.06.003