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Phillippa Lally; Cornelia H. M. van Jaarsveld; Henry W. W. Potts; Jane Wardle. (2010). How are habits formed: Modelling habit formation in the real world. , 40(6), 998–1009. doi:10.1002/ejsp.674 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research