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S.J. Williams; R.J. Pierce; N.J.H. Davies; D.M. Denison. (1979). Methods of studying lobar and segmental function of the lung in man. , 73(none), 0–112. doi:10.1016/0007-0971(79)90021-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research