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Mittal, Vikas; Ross, William T.; Baldasare, Patrick M. . (1998). The Asymmetric Impact of Negative and Positive Attribute-Level Performance on Overall Satisfaction and Repurchase Intentions. Journal of Marketing, 62(1), 33–47. doi:10.1177/002224299806200104 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research