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Fröhlich, Nikolaus; Pidun, Ulrich; Stahl, Martin; Frenking, Gernot . (1997). Carbenes as Pure Donor Ligands:  Theoretical Study of Beryllium−Carbene Complexes <sup>1</sup>. Organometallics, 16(3), 442–448. doi:10.1021/om960752v 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research