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S. Kaur; M. Nieuwenhuijsen; R. Colvile. (2005). Personal exposure of street canyon intersection users to PM2.5, ultrafine particle counts and carbon monoxide in Central London, UK. , 39(20), 3629–3641. doi:10.1016/j.atmosenv.2005.02.046 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research