@inproceedings{VLDB-1977-TohKS,
	author        = "Tetsuo Toh and Seiichi Kawazu and Kenji Suzuki",
	booktitle     = "{Proceedings of the Third International Conference on Very Large Data Bases}",
	cdrom         = "VLDB77/P403.PDF",
	pages         = "403--414",
	publisher     = "{IEEE Computer Society}",
	title         = "{Multi-Level Structures of the DBTG Data Model for an Achievement of Physical Data Independence}",
	year          = 1977,
}