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Crabbe, Andrew; Katz, Daniel; Striuli, Janet; Theodorescu, Emanoil . (2010). Hilbert-Samuel polynomials for the contravariant extension functor. Nagoya Mathematical Journal, 198(), 1–22. doi:10.1215/00277630-2009-005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research