Douglas S. Bridges. Constructive complements of unions of two closed sets. Math. Log. Q., 50(3):293-294, 2004. [doi]
@article{Bridges04,
title = {Constructive complements of unions of two closed sets},
author = {Douglas S. Bridges},
year = {2004},
doi = {10.1002/malq.200410093},
url = {http://dx.doi.org/10.1002/malq.200410093},
researchr = {https://researchr.org/publication/Bridges04},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {50},
number = {3},
pages = {293-294},
}