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Raymond J. Abraham; Jonathan J. Byrne; Lee Griffiths; Manuel Perez. (2006). 1H chemical shifts in NMR: Part 23, the effect of dimethyl sulphoxide <em>versus</em> chloroform solvent on 1H chemical shifts. , 44(5), 491–509. doi:10.1002/mrc.1747 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research