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Konopelchenko, B.G.. (1992). [Mathematics in Science and Engineering] Nonlinear Equations in the Applied Sciences Volume 185 || Bäcklund and Reciprocal Transformations: Gauge Connections. , (), 317–362. doi:10.1016/s0076-5392(08)62803-9 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research