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Chaubey, M. P.. (1988). Quantum theory of cyclotron-resonance line shape of a two-dimensional hole gas due to hole-phonon interaction in microstructures. Physical Review B, 38(8), 5422–5429. doi:10.1103/PhysRevB.38.5422 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research