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R.J.St. Leger; A.K. Charnley; R.M. Cooper. (1987). Characterization of cuticle-degrading proteases produced by the entomopathogen Metarhizium anisopliae. , 253(1), 0–232. doi:10.1016/0003-9861(87)90655-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research