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Yoshizawa, J. M.; Schafer, C. A.; Schafer, J. J.; Farrell, J. J.; Paster, B. J.; Wong, D. T. W. . (2013). Salivary Biomarkers: Toward Future Clinical and Diagnostic Utilities. Clinical Microbiology Reviews, 26(4), 781–791. doi:10.1128/CMR.00021-13 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research