Litovchenko, V. A. “Complete Solvability of the Cauchy Problem for Petrovskii Parabolic Equations in S-Type Spaces”. Ukrains’kyi Matematychnyi Zhurnal, vol. 54, no. 11, Nov. 2002, pp. 1467-79, https://umj.imath.kiev.ua/index.php/umj/article/view/4185.