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Michener, Robert; Lajtha, Kate . (2007). Stable Isotopes in Ecology and Environmental Science || Stable Isotope Tracing of Temporal and Spatial Variability in Organic Matter Sources to Freshwater Ecosystems. , 10.1002/9780470691854(), 283–333. doi:10.1002/9780470691854.ch10 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research