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Annegret Glitzky; Rolf Hünlich. (2000). Electro–Reaction–Diffusion Systems Including Cluster Reactions of Higher Order. , 216(1), 95–118. doi:10.1002/1522-2616(200008)216:1<95::aid-mana95>3.0.co;2-h 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research