PT - JOURNAL ARTICLE AU - N. Bulent Gultekin AU - Richard J. Rogalski TI - Duration: Response to critics AID - 10.3905/jpm.1989.409204 DP - 1989 Apr 30 TA - The Journal of Portfolio Management PG - 83--87 VI - 15 IP - 3 4099 - https://pm-research.com/content/15/3/83.short 4100 - https://pm-research.com/content/15/3/83.full