Melita Hajdinjak, Gavin M. Bierman. Extending relational algebra with similarities. Mathematical Structures in Computer Science, 22(4):686-718, 2012. [doi]
@article{HajdinjakB12,
title = {Extending relational algebra with similarities},
author = {Melita Hajdinjak and Gavin M. Bierman},
year = {2012},
doi = {10.1017/S0960129511000740},
url = {http://dx.doi.org/10.1017/S0960129511000740},
researchr = {https://researchr.org/publication/HajdinjakB12},
cites = {0},
citedby = {0},
journal = {Mathematical Structures in Computer Science},
volume = {22},
number = {4},
pages = {686-718},
}