Steven Vickers. A localic theory of lower and upper integrals. Math. Log. Q., 54(1):109-123, 2008. [doi]
@article{Vickers08, title = {A localic theory of lower and upper integrals}, author = {Steven Vickers}, year = {2008}, doi = {10.1002/malq.200710028}, url = {http://dx.doi.org/10.1002/malq.200710028}, researchr = {https://researchr.org/publication/Vickers08}, cites = {0}, citedby = {0}, journal = {Math. Log. Q.}, volume = {54}, number = {1}, pages = {109-123}, }