RT Journal Article SR Electronic T1 Convexity and exceptional return JF The Journal of Portfolio Management FD Institutional Investor Journals SP 43 OP 47 DO 10.3905/jpm.1990.409263 VO 16 IS 2 A1 Ronald N. Kahn A1 Roland W Lochoff YR 1990 UL https://pm-research.com/content/16/2/43.abstract AB