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Verheijen, Marcel A.; Algra, Rienk E.; Borgström, Magnus T.; Immink, George; Sourty, Erwan; van Enckevort, Willem J. P.; Vlieg, Elias; Bakkers, Erik P. A. M. . (2007). Three-Dimensional Morphology of GaP−GaAs Nanowires Revealed by Transmission Electron Microscopy Tomography. Nano Letters, 7(10), 3051–3055. doi:10.1021/nl071541q 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research