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Martin Vondenhof; Jochen Mattay. (1990). Sulfonic acid esters derived from 1,1′-binaphthalene as new axially chiral photosensitizers. , 31(7), 985–988. doi:10.1016/s0040-4039(00)94409-5 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research