1. V. M. Borok and M. A. Perel’man, “On the classes of uniqueness of solution of a multipoint boundary-value problem in an infinite layer,” Izv. Vyssh. Uchebn. Zaved., Matematika, No. 8, 29–34 (1973).
2. I. L. Vilents’, “Classes of uniqueness for the solution of the general boundary-value problem in a layer for systems of linear partial differential equations,” Dopov. Akad. Nauk Ukr. RSR, Ser. A, No. 3, 195–197 (1974).
3. I. M. Gel’fand and G. E. Shilov, Generalized Functions, Issue 3: Some Problems of the Theory of Differential Equations [in Russian], Fizmatgiz, Moscow (1958).
4. V. S. Il'kiv and Z. M. Nytrebych, "Estimate of the measure of level set for the solutions of differential equations with constant coefficients," Mat. Metody Fiz.-Mekh. Polya, 57, No. 3, 29-36 (2014)
5. English translation: J. Math. Sci., 217, No. 2, 166-175 (2016).