Semerenko, Y. A. “Energy Activation Spectrum of Low-Temperature Acoustic Relaxation in High-Purity Iron Single Crystal. Solution of the Inverse Problem of Mechanical Spectroscopy by the Tikhonov Regularization Method”. East European Journal of Physics, no. 2, Apr. 2021, pp. 73-80, doi:10.26565/2312-4334-2021-2-03.