HIMMEL, Martin. On the Solvability of Some Partial Differential Inequality. Acta Polytechnica, [S. l.], v. 53, n. 3, 2013. DOI: 10.14311/1805. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1805.. Acesso em: 22 jul. 2025.