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Roxanne Karimi; Carol L. Folt. (2006). Beyond macronutrients: element variability and multielement stoichiometry in freshwater invertebrates. , 9(12), 1273–1283. doi:10.1111/j.1461-0248.2006.00979.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research