“An analogue of Saint Venant’s principle and uniqueness of the first boundary-value problem in unbounded regions for a third order equation of combined type” (2006) Neliniini Kolyvannya, 9(1), pp. 117–126. Available at: https://twinhead.imath.kiev.ua/index.php/nosc/article/view/384 (Accessed: 22 January 2026).