RT Journal Article SR Electronic T1 Option Spreading JF The Journal of Portfolio Management FD Institutional Investor Journals SP 59 OP 63 DO 10.3905/jpm.1979.408698 VO 5 IS 4 A1 George M Frankfurter A1 Richard A. Stevenson A1 Allan Young YR 1979 UL https://pm-research.com/content/5/4/59.abstract AB