Witold Lipski Jr.
On Relational Algebra with Marked Nulls
PODS, 1984.
@inproceedings{PODS-1984-Lipski,
author = "Witold Lipski Jr.",
booktitle = "{Proceedings of the Third Symposium on Principles of Database Systems}",
cdrom = "['journals/anthology/cd1-3:PODS84/P201.PDF', 'journals/anthology/dvd1:text/1-3/PODS84/P201.PDF']",
doi = "10.1145/588011.588040",
isbn = "0-89791-128-8",
pages = "201--203",
publisher = "{ACM}",
title = "{On Relational Algebra with Marked Nulls}",
year = 1984,
}