Sven Hartmann, Uwe Leck, Sebastian Link. On Codd Families of Keys over Incomplete Relations. Comput. J., 54(7):1166-1180, 2011. [doi]
@article{HartmannLL11,
title = {On Codd Families of Keys over Incomplete Relations},
author = {Sven Hartmann and Uwe Leck and Sebastian Link},
year = {2011},
doi = {10.1093/comjnl/bxq073},
url = {http://dx.doi.org/10.1093/comjnl/bxq073},
researchr = {https://researchr.org/publication/HartmannLL11},
cites = {0},
citedby = {0},
journal = {Comput. J.},
volume = {54},
number = {7},
pages = {1166-1180},
}