Lloyd Humberstone. Inverse Images of Box Formulas in Modal Logic. Studia Logica, 101(5):1031-1060, 2013. [doi]
@article{Humberstone13,
title = {Inverse Images of Box Formulas in Modal Logic},
author = {Lloyd Humberstone},
year = {2013},
doi = {10.1007/s11225-012-9419-6},
url = {http://dx.doi.org/10.1007/s11225-012-9419-6},
researchr = {https://researchr.org/publication/Humberstone13},
cites = {0},
citedby = {0},
journal = {Studia Logica},
volume = {101},
number = {5},
pages = {1031-1060},
}