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Maja Bulatović; Marloes W. Heijstek; Marleen Verkaaik; E. H. Pieter van Dijkhuizen; Wineke Armbrust; Esther P. A. Hoppenreijs; Sylvia Kamphuis; Wietse Kuis; Toine C. G. Egberts; Gerben Sinnema; Carin M. A. Rademaker; Nico M. Wulffraat. (2011). High prevalence of methotrexate intolerance in juvenile idiopathic arthritis: Development and validation of a methotrexate intolerance severity score. , 63(7), 2007–2013. doi:10.1002/art.30367 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research