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M.I. Tsindlekht, N. Logoboy, V.S. Egorov, R.B.G. Kramer, A.G.M. Jansen, and W. Joss, Giant parametric amplification of the nonlinear response in a single crystal of beryllium in a quantizing magnetic field, Low Temp. Phys. 32, (2006) [Fiz. Nizk. Temp. 32, 1129-1135, (2006)] DOI: https://doi.org/10.1063/1.2356842.