1. Auer, P.: Some hitting probabilities of random walks on Z 2. In: Berkes, I., Csáki, E., Révész, P. eds., Limit Theorems in Probability and Statistics, Volume 57 of Colloquia Mathematica Societatis János Bolyai. (Budapest, Hungary), 1990. Amsterdam: North-Holland, pp. 9–25
2. Beneš, C.: Some Estimates for Planar Random Walk and Brownian Motion. Preprint, 2006. http://arxiv.org/abs/math/0611127v1 [math.DR], 2006
3. Borovkov A.A.: On the rate of convergence for the invariance principle. Theory Prob. Appl. 18, 207–225 (1973)
4. Chelkak D., Smirnov S.: Universality in the 2D Ising model and conformal invariance of fermionic observables. Invent. Math. 189, 515–580 (2012)
5. Csörgő M., Révész P.: Strong Approximations in Probability and Statistics. Academic Press, New York (1981)