1. I. V. Astashova, “On asymptotic behavior of solutions of certain nonlinear differential equations,” in: Reports of Extended Sessions of the I. N. Vekua Institute of Applied Mathematics [in Russian], 1, No. 3, Tbilisi State Univ. (1985), pp. 9–11.
2. I. V. Astashova, “On the asymptotic behavior of solutions of certain nonlinear differential equations,” Usp. Mat. Nauk, 40, No. 5, 197 (1995).
3. I. V. Astashova, “On the asymptotic behavior of solutions for a certain class of nonlinear differential equations,” Differents. Uravn., 22, No. 12, 2185 (1986).
4. I. V. Astashova, “On the asymptotic behavior of changing-sign solutions of certain nonlinear first and second-order equations,” In: Reports of Extended Sessions of I. N. Vekua Institute of Applied Mathematics [in Russian], 3, No. 3, Tbilisi State Univ. (1988), pp. 9–12.
5. I. V. Astashova, “On asymptotic properties of the one-dimensional Schrödinger equation,” Operator Theory: Advances Appl., 114, 15–19 (2000).