Vasco Brattka, Guido Gherardi. Borel Complexity of Topological Operations on Computable Metric Spaces. Journal of Logic and Computation, 19(1):45-76, 2009. [doi]
@article{BrattkaG09,
title = {Borel Complexity of Topological Operations on Computable Metric Spaces},
author = {Vasco Brattka and Guido Gherardi},
year = {2009},
doi = {10.1093/logcom/exn027},
url = {http://dx.doi.org/10.1093/logcom/exn027},
researchr = {https://researchr.org/publication/BrattkaG09},
cites = {0},
citedby = {0},
journal = {Journal of Logic and Computation},
volume = {19},
number = {1},
pages = {45-76},
}