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Jean-Pierre Fouassier; Dominique Burr; Fernand Wieder. (1991). Water-soluble photoinitiators: Primary processes in hydroxy alkyl phenyl ketones. , 29(9), 1319–1327. doi:10.1002/pola.1991.080290911 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research