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Fabio M. Guarino, Franco Andreone and Francesco Angelini. (1998). Growth and Longevity by Skeletochronological Analysis in Mantidactylus microtympanum, a Rain-Forest Anuran from Southern Madagascar. Copeia, 1998(1), 194–198. doi:10.2307/1447718 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research