LitovchenkoV. A., and UnguryanG.M. 2017. “Fundamental Solution of the Cauchy Problem for the Shilov-Type Parabolic Systems With Coefficients of Bounded Smoothness”. Ukrains’kyi Matematychnyi Zhurnal 69 (3), 348-64. https://umj.imath.kiev.ua/index.php/umj/article/view/1701.