@article{article6c8eae5c,
title   = {A class of globally non-solvable involutive systems on the torus},
author = {Medeira, Cleber de and Zani, Sérgio Luís},
year = {2019},
doi = {10.1007/s11868-018-0252-1},
journal   = {Journal of Pseudo-Differential Operators and Applications}
}