Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Yahiko Kambayashi and M. Iwaihara and Tetsuya Furukawa,Navigation and schema transformations for producing nested relations from networks,[1991] Proceedings. Seventh International Conference on Data Engineering,,IEEE Comput. Soc. Press,2002-12-10,,,181-190,https://cir.nii.ac.jp/crid/1871709542980481792,https://doi.org/10.1109/icde.1991.131465