BritovN. A. 1995. “On the Triviality Condition for the Kernel of the Linearized First Boundary-Value Problem for a System of Equations of Magnetic Hydrodynamics”. Ukrains’kyi Matematychnyi Zhurnal 47 (2), 168–173. https://umj.imath.kiev.ua/index.php/umj/article/view/5400.