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G. Rutger Persson; Bettina Schlegel-Bregenzer; Niklaus P. Lang; Rolf Attström. (1999). Education in periodontology A need for a new teaching model. , 3(2), 74–81. doi:10.1111/j.1600-0579.1999.tb00072.x 

An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research