RT Journal Article SR Electronic T1 From Equilibrium to Non-Linear Dynamics in Investment Management JF The Journal of Portfolio Management FD Institutional Investor Journals SP 19 OP 30 DO 10.3905/jpm.1996.409561 VO 22 IS 4 A1 Sergio M Focardi YR 1996 UL https://pm-research.com/content/22/4/19.abstract AB