Shaoyi Liao, Huaiqing Wang, Wei-Yi Liu. Functional dependencies with null values, fuzzy values, and crisp values. IEEE T. Fuzzy Systems, 7(1):97-103, 1999. [doi]
@article{LiaoWL99-0,
title = {Functional dependencies with null values, fuzzy values, and crisp values},
author = {Shaoyi Liao and Huaiqing Wang and Wei-Yi Liu},
year = {1999},
doi = {10.1109/91.746321},
url = {http://dx.doi.org/10.1109/91.746321},
researchr = {https://researchr.org/publication/LiaoWL99-0},
cites = {0},
citedby = {0},
journal = {IEEE T. Fuzzy Systems},
volume = {7},
number = {1},
pages = {97-103},
}