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Rüdiger von Kries; André Michael Toschke; Klaus Straßburger; Michael Kundi; Helen Kalies; Uta Nennstiel; Gerhard Jorch; Joachim Rosenbauer; Guido Giani. (2005). Sudden and unexpected deaths after the administration of hexavalent vaccines (diphtheria, tetanus, pertussis, poliomyelitis, hepatitis B,Haemophilius influenzaetype b): is there a signal?. , 164(2), 61–69. doi:10.1007/s00431-004-1594-7 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research