A. Békéssy, János Demetrovics. Contribution to the theory of data base relations. Discrete Mathematics, 27(1):1-10, 1979. [doi]
@article{BekessyD79,
title = {Contribution to the theory of data base relations},
author = {A. Békéssy and János Demetrovics},
year = {1979},
doi = {10.1016/0012-365X(79)90064-5},
url = {http://dx.doi.org/10.1016/0012-365X(79)90064-5},
researchr = {https://researchr.org/publication/BekessyD79},
cites = {0},
citedby = {0},
journal = {Discrete Mathematics},
volume = {27},
number = {1},
pages = {1-10},
}