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Pierre Binétruy; Cédric Deffayet; Ulrich Ellwanger; David Langlois. (2000). Brane cosmological evolution in a bulk with cosmological constant. , 477(1-3), 285–291. doi:10.1016/s0370-2693(00)00204-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research