1. Z. S. Agranovich and V. A. Marchenko, The Inverse Problem in the Theory of Scattering, Khar’kov Univ., Khar’kov (1960), 268 pp.
2. L. D. Akulenko and V.M. Volosov, “The problem of stationary rotations in an autonomous system,” Vestn. Mosk. Univ. Matem., Mekhan., No. 6, 34–39 (1966).
3. L. D. Akulenko and V. M. Volosov, “Resonance in rotational systems,” Vestn. Mosk. Univ. Matem., Mekhan., No. 1, 12–16 (1967).
4. L. D. Akulenko and V. M. Volosov, “High-order resonance rotations,” Vestn. Mosk. Univ. Matem., Mekhan., No. 2, 10–14 (1967).
5. V. M. Alekseev, “On a problem with a small paramter,” Vestn. Mosk.Univ. Matem., Mekhan., No. 4, 17–27 (1962).