1. See, e.g., S. RednerA Guide to First-Passage Processes(Cambridge University Press, Cambridge, 2001), and references therein.
2. S. N. MajumdarCurr. Sci. India
77370 (1999), also available as condmat/9907407.
3. H. P. McKeanJ. Math.Kyoto Univ.
2227 (1963); A. M. GoldmanAnn. Math. Stat.
422150 (1971); Y. G. SinaiTheor. Math. Phys.
90219 (1992); T. W. BurkhardtJ. Phys. A
26L1157 (1993).
4. A simple derivation of9 =1/4 can be found in T. W. BurkhardtJ.
Phys. A
33L429 (2000).
5. G. Ehrhardt, S. N. Majumdar and A. J. Bray, in preparation.