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Varjú, K.; Mairesse, Y.; Agostini, P.; Breger, P.; Carré, B.; Frasinski, L. J.; Gustafsson, E.; Johnsson, P.; Mauritsson, J.; Merdji, H.; Monchicourt, P.; L’Huillier, A.; Salières, P. . (2005). Reconstruction of Attosecond Pulse Trains Using an Adiabatic Phase Expansion. Physical Review Letters, 95(24), 243901–. doi:10.1103/PhysRevLett.95.243901 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research