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Wennlund, A.. (1986). Variation in serum levels of T3, T4, FT4 and TSH during thyroxine replacement therapy. European Journal of Endocrinology, 113(1), 47–49. doi:10.1530/acta.0.1130047 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research