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Mara D. Neusel. (2006). Inseparable Extensions of Algebras over the Steenrod Algebra with Applications to Modular Invariant Theory of Finite Groups. Transactions of the American Mathematical Society, 358(11), 4689–4720. doi:10.2307/3845397 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research