N. A. Kulesko, B. Ya. Levin, “The completeness of the Floquet solutions for second order differential equations with deviating argument”, Sibirsk. Mat. Zh., 18:2 (1977), 321–326; Siberian Math. J., 18:2 (1977), 230–234
N. A. Kulesko, “Completeness of the system of Floquet solutions of equations of the neutral type”, Mat. Zametki, 3:3 (1968), 297–306; Math. Notes, 3:3 (1968), 188–193
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