PT - JOURNAL ARTICLE AU - Vijay Kumar Chopra TI - Improving Optimization AID - 10.3905/joi.2.3.51 DP - 1993 Aug 31 TA - The Journal of Investing PG - 51--59 VI - 2 IP - 3 4099 - https://pm-research.com/content/2/3/51.short 4100 - https://pm-research.com/content/2/3/51.full