O. B. Markevych, O. M. Horina, V. Y. Stadnyk, R. S. Brezvin, Z. O. Kohut, and I. B. Pirko, Elasto-optic properties of K₂SO₄ crystals, Low Temp. Phys. 52, (2026) (in press) [Fiz. Nyzk. Temp. 52, 1363–1370, (2026)].