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Y. Shahali; Z. Pourpak; M. Moin; A. Mari; A. Majd. (2009). Instability of the structure and allergenic protein content in Arizona cypress pollen. , 64(12), 1773–1779. doi:10.1111/j.1398-9995.2009.02064.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research