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Tomashefski, Joseph F.; Cagle, Philip T.; Farver, Carol F.; Fraire, Armando E. . (2008). Dail and Hammar’s Pulmonary Pathology || Anatomy and Histology of the Lung. , 10.1007/978-0-387-68792-6(Chapter 2), 20–48. doi:10.1007/978-0-387-68792-6_2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research