5Estep T. Security analysis and stock selection: Turning financial information into return forecasts[J]. Financial Analysts Journal, 1987, 43(7): 34-43.
6Sahlman W A. Aspects of financial contracting in venture capital [J]. Journal of Applied Corporate Finance, 1989, 1(1): 136-175.
7Fried V H, Hisrich R D. Toward a model of venture capital investment decision making [J]. Financial Management, 1994, 23(3): 28-37.