PT - JOURNAL ARTICLE AU - James R. Vertin TI - What can the future tell us about the past? AID - 10.3905/jpm.1979.408721 DP - 1979 Oct 31 TA - The Journal of Portfolio Management PG - 63--66 VI - 6 IP - 1 4099 - https://pm-research.com/content/6/1/63.short 4100 - https://pm-research.com/content/6/1/63.full