Paolo Gentilini. Provability Logic in the Gentzen Formulation of Arithmetic. Math. Log. Q., 38(1):535-550, 1992. [doi]
@article{Gentilini92,
title = {Provability Logic in the Gentzen Formulation of Arithmetic},
author = {Paolo Gentilini},
year = {1992},
doi = {10.1002/malq.19920380150},
url = {http://dx.doi.org/10.1002/malq.19920380150},
researchr = {https://researchr.org/publication/Gentilini92},
cites = {0},
citedby = {0},
journal = {Math. Log. Q.},
volume = {38},
number = {1},
pages = {535-550},
}