Received 08 June 2012Accepted 08 March 2013Published online 02 April 2013
This work is supported in part by the National Science Council (NSC) of the Republic of China under Grant No. NSC-99-2112-M-032-002-MY3, and in part by the National Center for Theoretical Sciences (North Branch) of R.O.C.
Article outline: I. INTRODUCTION II. SCALING OF FOKKER-PLANCK EQUATION III. CLASS I: TWO MOVING BOUNDARIES IV. CLASS II: ONE MOVING BOUNDARY WITH x = 0 A FIXED POINT V. CLASS III: ONE MOVING BOUNDARY WITH x = ∞ A FIXED POINT VI. DISCUSSION
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