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1. L. I. Gurvits, A. G. Polnarev, S. Frey, O. Titov,  A.A. Osetrova, X. Fan, A. Melnikov : Milliarcsecond astrometric oscillations in active galactic nuclei as a precursor of multi-messenger gravitational wave events // Astronomy & Astrophysics, Volume 700, 13 (2025)
2. Oleg Titov, Sándor Frey, Alexey Melnikov, Sébastien Lambert, Fengchun Shu, Bo Xia, Javier González, Belén Tercero, Sergey Gulayev, Stuart Weston, Tim Natusch: Unprecedented change in the position of four radio sources // Monthly Notices of the Royal Astronomical Society, Vol. 512, 874–883 (2022)
3. S. Frey, O. Titov, A. E. Melnikov, P. de Vicente, F. Shu: High-resolution radio imaging of two luminous quasars beyond redshift 4.5 // Astronomy and Astrophysics, Volume 618, A68 (2018)
4. G. Orosz, M. J. Rioja, R. Dodson, H. Imai, S. Frey5: Multiview Phase Corrections at Low Frequencies for Precise Astrometry // Transactions of IAA RAS, issue 40, 34–39 (2017)