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E. I. Vorobyeva; D. N. Mednikov. (2002). Characteristics of Development and Ossification of Skeletal Elements in the Limbs of the Smooth NewtTriturus vulgaris(Caudata). , 387(1-6), 565–568. doi:10.1023/a:1021706028066 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research