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Joris, Liesbet; Dab, Isi; Quinton, Paul M. . (1993). Elemental Composition of Human Airway Surface Fluid in Healthy and Diseased Airways. American Review of Respiratory Disease, 148(6_pt_1), 1633–1637. doi:10.1164/ajrccm/148.6_Pt_1.1633 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research