Some preprints in PDF/PS format

• Branching random walk in Z^4 with branching at the origin only   (with Vladimir Vatutin and Valentin Topchii)
• Almost sure convergence for stochastically biased random walks on trees   (with Gabriel Faraud and Zhan Shi)
• Strong approximations in a charged-polymer model   (with Davar Khoshnevisan)
• Asymptotics for the survival probability in a killed branching random walk   (with Nina Gantert and Zhan Shi)

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