Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) PRAVEEN SESHANDRI M. L.,The case for enhanced abstract data types,"Proceedings of the 23rd International Conference on Very Large Data Bases, Athens, Greece, August 1997",,,1997,,,,https://cir.nii.ac.jp/crid/1570291225594999552,