PODOLINNYI, S. I. Perturbation of homogeneous parabolic pseudodifferential equations by locally unbounded vector fields. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 11, p. 1561–1566, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5157. Acesso em: 14 apr. 2025.