@article{article31e0a7e2,
title   = {Solvability near the characteristic set for a class of first-order linear partial differential operators},
author = {Cerniauskas, Wanderley A and Dattori da Silva, Paulo Leandro},
year = {2018},
doi = {10.1002/mana.201600426},
journal   = {Mathematische Nachrichten}
}