[1]BLANK F,SCHOLES M. The pricing of options and corporate liabilities[J]. Political economy,1973,81(3):637-654.
[2]WILMOTT P,DEWYNNE J,HOWISON S. Option pricing[M]. London:Oxford Financial Press,1993.
[3]GUO X,SHEPP L. Some optimal stopping problems with nontrival boundaries for pricing exotic options[J]. Appl Prob,2001,38:647-658.
[4]JIANG L S. Mathematical modeling and methods of option pricing[M]. Singapore:World Scientific,2005.
[5]AVNER FRIEDMAN. Variational principle and free boundary problems[M]. New York:John Wiley & Sons,1982.
[6]陈亚浙. 二阶抛物型偏微分方程[M]. 北京:北京大学出版社,2003.
[7]CONNON J R,HENRY D B,KOTLOV D B. Continuous differentiability of the free boundary for weak solutions of the Stefan problem[J]. Bull Ane Math Soc,1974,80:45-48.
[8]FRIEDMAN A. Parabolic variational inequalities in one space dimension and smoothness of the free boundary[J]. J?Funct Anal,1975,18:151-176.