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Palwinder Singh; Matinder Kaur; Wolfgang Holzer. (2010). Synthesis and evaluation of indole, pyrazole, chromone and pyrimidine based conjugates for tumor growth inhibitory activities – Development of highly efficacious cytotoxic agents. , 45(11), 4968–4982. doi:10.1016/j.ejmech.2010.08.004 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research