Podolinnyi, S. I. (1997) “Perturbation of homogeneous parabolic pseudodifferential equations by locally unbounded vector fields”, Ukrains’kyi Matematychnyi Zhurnal, 49(11), pp. 1561–1566. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5157 (Accessed: 21May2024).