LI , W.-N.; CUI, B.-T. OSCILLATION OF SOLUTIONS OF PARABOLIC EQUATIONS OF NEUTRAL TYPE. Tamkang Journal of Mathematics, [S. l.], v. 30, n. 4, p. 331–338, 1999. DOI: 10.5556/j.tkjm.30.1999.4239. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4239. Acesso em: 5 may. 2024.