V. A. Shklovskij, O. S. Naboichenko, and L. A. Kotvytska, Nonlinear relaxation between magnons and phonons in insulating ferromagnets in the external magnetic field, Low Temp. Phys. 48, (2022) [Fiz. Nyzk. Temp. 48, 817–823, (2022)] DOI: https://doi.org/10.1063/10.0013297.