V. M. Gvozdikov, A. M. Ermolaev, and R. Vega-Monroy, Helicons and magnetoimpurity waves in layered conductors, Low Temp. Phys. 25, (1999) [Fiz. Nizk. Temp. 25, 718-724, (1999)] DOI: https://doi.org/10.1063/1.593780.