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Bechtold, W.A.; Zarnoch, S.J.; Burkman, W.G. . (1998). Comparisons of Modeled Height Predictions to Ocular Height Estimates. Southern Journal of Applied Forestry, 22(4), 216–221. doi:10.1093/sjaf/22.4.216 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research