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Perrakis, Stylianos; Zhong, Rui . (2015). Credit spreads and state-dependent volatility: Theory and empirical evidence. Journal of Banking & Finance, 55(), 215–231. doi:10.1016/j.jbankfin.2015.02.017 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research