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Ammannati, Edoardo; Jacob, Dorrit E.; Avanzinelli, Riccardo; Foley, Stephen F.; Conticelli, Sandro . (2016). Low Ni olivine in silica-undersaturated ultrapotassic igneous rocks as evidence for carbonate metasomatism in the mantle. Earth and Planetary Science Letters, 444(), 64–74. doi:10.1016/j.epsl.2016.03.039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research