@article{GDZPPN002045532,
title = {A lower bound for the complexity of Craig's interpolants in sentinential logic.},
journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
volume = {23},
year = {1983},
pages = {27-36},
zbl = {0511.03004},
url = {http://dml.mathdoc.fr/item/GDZPPN002045532}
}
Mundici, Daniele. A lower bound for the complexity of Craig's interpolants in sentinential logic.. Archiv für mathematische Logik und Grundlagenforschung, Tome 23 (1983) pp. 27-36. http://gdmltest.u-ga.fr/item/GDZPPN002045532/