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Manfredo P. do Carmo; Qiaoling Wang; Changyu Xia. (2010). Inequalities for eigenvalues of elliptic operators in divergence form on Riemannian manifolds. , 189(4), 643–660. doi:10.1007/s10231-010-0129-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research