E.V. Tartakovskaya, A.S. Laurenson, and V.V. Kruglyak, Wannier–Stark ladder spectrum of Bloch oscillations of magneto-dipole spin waves in graded 1D magnonic crystals, Low Temp. Phys. 46, (2020) [Fiz. Nizk. Temp. 46, 984-990, (2020)] DOI: https://doi.org/10.1063/10.0001550.