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Herink, G.; Kurtz, F.; Jalali, B.; Solli, D. R.; Ropers, C. . (2017). Real-time spectral interferometry probes the internal dynamics of femtosecond soliton molecules. Science, 356(6333), 50–54. doi:10.1126/science.aal5326 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research