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Wonnop Visessanguan; Soottawat Benjakul; Haejung An. (2003). Purification and characterization of cathepsin L in arrowtooth flounder (Atheresthes stomias) muscle. , 134(3), 0–487. doi:10.1016/s1096-4959(02)00293-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research