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Obregón-Rodríguez, N.; Fernández-Riveiro, P.; Piñeiro-Lamas, M.; Smyth-Chamosa, E.; Montes-Martínez, A.; Suárez-Cunqueiro, M. M. . (2019). Prevalence and caries-related risk factors in schoolchildren of 12- and 15-year-old: a cross-sectional study. BMC Oral Health, 19(1), 120–. doi:10.1186/s12903-019-0806-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research