Eugene Y. Sheng. On bi-level conceptual schemas. In ACM Conference on Computer Science. pages 483-488, 1993. [doi]
@inproceedings{Sheng93, title = {On bi-level conceptual schemas}, author = {Eugene Y. Sheng}, year = {1993}, doi = {10.1145/170791.171123}, url = {http://doi.acm.org/10.1145/170791.171123}, tags = {XML, XML Schema}, researchr = {https://researchr.org/publication/Sheng93}, cites = {0}, citedby = {0}, pages = {483-488}, booktitle = {ACM Conference on Computer Science}, }