Robert A. G. Seely. Hyperdoctrines, Natural Deduction and the Beck Condition. Math. Log. Q., 29(10):505-542, 1983. [doi]
@article{Seely83,
title = {Hyperdoctrines, Natural Deduction and the Beck Condition},
author = {Robert A. G. Seely},
year = {1983},
doi = {10.1002/malq.19830291005},
url = {http://dx.doi.org/10.1002/malq.19830291005},
researchr = {https://researchr.org/publication/Seely83},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {29},
number = {10},
pages = {505-542},
}