RT Journal Article SR Electronic T1 Editors’ Introduction to the Special Issue on Investment Models JF The Journal of Portfolio Management FD Institutional Investor Journals SP 1 OP 5 DO 10.3905/jpm.2021.47.5.001 VO 47 IS 5 A1 Fabozzi, Frank J. A1 Koedijk, Kees YR 2021 UL http://jpm.pm-research.com/content/47/5/1.abstract AB