PT - JOURNAL ARTICLE AU - Allan Twark AU - James P. D'mello TI - Model indexation AID - 10.3905/jpm.1991.409347 DP - 1991 Jul 31 TA - The Journal of Portfolio Management PG - 37--40 VI - 17 IP - 4 4099 - https://pm-research.com/content/17/4/37.short 4100 - https://pm-research.com/content/17/4/37.full