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Wigen, Philip E. (1994). Nonlinear Phenomena and Chaos in Magnetic Materials || SPIN-WAVE AUTO-OSCILLATIONS IN YIG SPHERES DRIVEN BY PARALLEL PUMPING AND SUBSIDIARY RESONANCE. , 10.1142/1686(), 113–140. doi:10.1142/9789814355810_0005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research