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Philip W. Choquette (2), Lloyd C. P, . (1970). Geologic Nomenclature and Classification of Porosity in Sedimentary Carbonates. AAPG Bulletin, 54(), –. doi:10.1306/5D25C98B-16C1-11D7-8645000102C1865D 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research