PT - JOURNAL ARTICLE AU - Meir I. Schneller TI - Efficient frontiers in factor economies AID - 10.3905/jpm.1990.409261 DP - 1990 Jan 31 TA - The Journal of Portfolio Management PG - 23--25 VI - 16 IP - 2 4099 - https://pm-research.com/content/16/2/23.short 4100 - https://pm-research.com/content/16/2/23.full