6Alan Levinsohn. A Garden of Stock Options Help Harvest Talent [J].Stragetic Flnance, 2001, (9) :81-82.
7Johnson S.A, Tian Y.S. The value and incentive effects of nontraditional executive stock option plans [J].Journal of Financial Economics,2000,(57):3-34.
8Shane A. Johnson, Yisong S. Tian. Indexed executive stock options [J]. Journal of Financial Economics, 2000,(57):35-64.
9Galvin H. Johnson. Stock and Stock Option Compensation: A Bad Idea [J]. Canadian Tax Journal, 2003, Vol 51, No.3:1259-1289.