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Koo, Soo Kweon; Moon, Ji Seung; Jung, Sung Hoon; Mun, Mi Jin . (2016). A case of bilateral inferior concha bullosa connecting to maxillary sinus. Brazilian Journal of Otorhinolaryngology, (), S1808869416300167–. doi:10.1016/j.bjorl.2016.01.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research