LIU, S.-T.; CHENG, S.-S. NONEXISTENCE OF POSITIVE SOLUTIONS OF A NONLINEAR PARTIAL DIFFERENCE EQUATION. Tamkang Journal of Mathematics, [S. l.], v. 28, n. 1, p. 51–58, 1997. DOI: 10.5556/j.tkjm.28.1997.4334. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4334. Acesso em: 5 may. 2024.