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V. I. Khrabustovskyi, «On the Limit of Regular Dissipative and Self-Adjoint Boundary Value Problems with Nonseparated Boundary Conditions when an Interval Stretches to the Semiaxis», Журн. мат. фіз. анал. геом., вип. 5, вип. 1, с. 54–81, Бер 2009.