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Holm, Charlotte; Mayr, Martina; H??fter, Eugen; Ninkovic, Milomir . (2006). Perfusion Zones of the DIEP Flap Revisited: A Clinical Study. Plastic and Reconstructive Surgery, 117(1), 37–43. doi:10.1097/01.prs.0000185867.84172.c0 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research