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Zrenner, Rita; Stitt, Mark; Sonnewald, Uwe; Boldt, Ralf . (2006). PYRIMIDINE AND PURINE BIOSYNTHESIS AND DEGRADATION IN PLANTS. Annual Review of Plant Biology, 57(1), 805–836. doi:10.1146/annurev.arplant.57.032905.105421 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research