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Kotthaus, Simone; Smith, Thomas E.L.; Wooster, Martin J.; Grimmond, C.S.B. . (2014). Derivation of an urban materials spectral library through emittance and reflectance spectroscopy. ISPRS Journal of Photogrammetry and Remote Sensing, 94(), 194–212. doi:10.1016/j.isprsjprs.2014.05.005 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research