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T. Skomedal; B. Grynne; J. B. Osnes; A. E. Sjetnan; I. Øye. (1980). A Radioimmunoassay for cyclic AMP (cAMP) Obtained by Acetylation of Both Unlabeled and Labeled (3H-cAMP) Ligand, or of Unlabeled Ligand only. , 46(3), 200–204. doi:10.1111/j.1600-0773.1980.tb02443.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research