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Mary J. Welch; John R. Purkiss; Keith A. Foster. (2000). Sensitivity of embryonic rat dorsal root ganglia neurons to Clostridium botulinum neurotoxins. , 38(2), 0–258. doi:10.1016/s0041-0101(99)00153-1 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research