PT - JOURNAL ARTICLE AU - Seymour Smidt TI - Investment Horizons and Performance Measurement AID - 10.3905/jpm.1978.408627 DP - 1978 Jan 31 TA - The Journal of Portfolio Management PG - 18--22 VI - 4 IP - 2 4099 - https://pm-research.com/content/4/2/18.short 4100 - https://pm-research.com/content/4/2/18.full