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Vitaliy Syvokon and Yuri Kovdrya, Conductivity of a 2D electron crystal over liquid helium in the region of coupled electron–ripplon resonances: Physics in Quantum Crystals, Low Temp. Phys. 29, (2003) [Fiz. Nizk. Temp. 29, 967-969, (2003)] DOI: https://doi.org/10.1063/1.1614177.