Reference:
Tadeusz Litak: Constructive Modalities with Provability Smack (Author's Cut), 2017. Unabridged and extended version of a chapter in the Esakia volume of "Outstanding Contributions to Logic"
Bibtex Entry:
@misc{litak2017constructive,
title={Constructive Modalities with Provability Smack (Author's Cut)},
author={Tadeusz Litak},
year={2017},
url = {https://arxiv.org/abs/1708.05607},
eprint={1708.05607},
archivePrefix={arXiv},
primaryClass={cs.LO},
note = {Unabridged and extended version of a chapter in the Esakia volume of "Outstanding Contributions to Logic"}
}