RT Journal Article SR Electronic T1 Implied Volatility Skews and Stock Index Skewness and Kurtosis Implied by S&P 500 Index Option Prices JF The Journal of Derivatives FD Institutional Investor Journals SP 8 OP 19 DO 10.3905/jod.1997.407978 VO 4 IS 4 A1 Charles J. Corrado A1 Tie Su YR 1997 UL https://pm-research.com/content/4/4/8.abstract AB