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Navarro, J. L.; López, M.L.; Maestri, D.M.; Labuckas, D.O. . (2001). Physical characteristics and chemical composition of Greater Rhea ( Rhea americana ) eggs from wild and captive populations. British Poultry Science, 42(5), 658–662. doi:10.1080/00071660120088515 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research