1、http://www.iijournals.com/doi/abs/10.3905/jpm.1983.408923
Sources of value and risk in common stocks*

Tony Estep, Nick Hanson and Cal Johnson

The Journal of Portfolio Management Summer 1983, Vol. 9, No. 4: pp. 5-13
DOI: 10.3905/jpm.1983.408923

2、http://www.iijournals.com/doi/abs/10.3905/jpm.1984.408984?journalCode=jpm
Prediction of common stock investment risk

Barr Rosenberg

The Journal of Portfolio Management Fall 1984, Vol. 11, No. 1: pp. 44-53
DOI: 10.3905/jpm.1984.408984