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Ott, Adina K.; Rechtsteiner, Gregory A.; Felix, Christian; Hampe, Oliver; Jarrold, Martin F.; Van Duyne, Richard P.; Raghavachari, Krishnan . (1998). Raman spectra and calculated vibrational frequencies of size-selected C[sub 16], C[sub 18], and C[sub 20] clusters. The Journal of Chemical Physics, 109(22), 9652–. doi:10.1063/1.477632 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research