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G. Venkataiah; P. Venugopal Reddy. (2008). Electrical transport properties of Nd0.67−xEuxSr0.33MnO3(0. , 43(14), 4760–4767. doi:10.1007/s10853-008-2672-4 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research