@article{article80656363,
title   = {Geometrical proofs for the global solvability of systems},
author = {Bergamasco, Adalberto Panobianco and Parmeggiani, Alberto and Zani, Sérgio Luís and Zugliani, Giuliano Angelo},
year = {2018},
doi = {10.1002/mana.201700300},
journal   = {Mathematische Zeitschrift}
}