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López-Rios, T.; Mendoza, D.; García-Vidal, F. J.; Sánchez-Dehesa, J.; Pannetier, B. . (1998). Surface Shape Resonances in Lamellar Metallic Gratings. Physical Review Letters, 81(3), 665–668. doi:10.1103/physrevlett.81.665 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research