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Spornberger, A.; Steffek, R.; Jezik, K.; Stich, K. . (2011). Long-Term Effect of Different Fertilizing and Plant Protection Systems (Organic vs. Conventional) on Field Characteristics of Strawberries ( <i>Fragaria</i> × <i>ananassa</i> ). Biological Agriculture & Horticulture, 27(2), 179–188. doi:10.1080/01448765.2011.9756646 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research