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T. Nowozin; A. Marent; D. Bimberg; A. Beckel; B. Marquardt; A. Lorke; M. Geller. (2012). Time-resolved detection of many-particle hole states in InAs/GaAs quantum dots using a two-dimensional hole gas up to 77 K. , 9(2), 243–246. doi:10.1002/pssc.201100218 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research