RT Journal Article SR Electronic T1 Quantifying the SIGMA X Crossing Benefit JF The Journal of Trading FD Institutional Investor Journals SP 84 OP 91 DO 10.3905/jot.2008.3.4.84 VO 3 IS 4 A1 George Sofianos A1 David Jeria YR 2008 UL https://pm-research.com/content/3/4/84.abstract AB