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Figueira, Cláudia A.; Lopes, Patrícia S.; Gomes, Pedro T. . (2015). Synthesis of 2-arylpyrroles via catalytic dehydrogenation of 2-aryl-1-pyrrolines in the presence of palladium-supported on alumina. Tetrahedron, 71(25), 4362–4371. doi:10.1016/j.tet.2015.04.043 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research