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Stasek, David J.; Bean, Caitlin; Crist, Thomas O. . (2008). Butterfly Abundance and Movements Among Prairie Patches: The Roles of Habitat Quality, Edge, and Forest Matrix Permeability. Environmental Entomology, 37(4), 897–906. doi:10.1603/0046-225X(2008)37[897:BAAMAP]2.0.CO;2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research