2 citations to https://www.mathnet.ru/eng/semr1403

1. E. V. Korablina, V. B. Levenshtam, “ASYMPTOTIC PROBLEMS OF RECONSTRUCTION OF HIGH-FREQUENCY DATA OF THE WAVE EQUATION”, J Math Sci, 271:4 (2023), 407  
2. V. B. Levenshtam, “Asymptotic Problems of Reconstructing a High-Frequency Source of a Wave Equation”, Math. Notes, 111:4 (2022), 636–642