RT Journal Article SR Electronic T1 Stock Market Volatility Around Expiration Days JF The Journal of Derivatives FD Institutional Investor Journals SP 23 OP 43 DO 10.3905/jod.1996.407969 VO 4 IS 2 A1 G. Andrew Karolyi YR 1996 UL https://pm-research.com/content/4/2/23.abstract AB