On the Hausdorff dimension of a Julia set with a rationally indifferent periodic point M. Urbański — 1990 Studia Mathematica
Relating Hausdorff measures and harmonic measures on parabolic Jordan curves. M. Denker; M. Urbanski — 1994 Journal für die reine und angewandte Mathematik
Porosity of Julia sets of non-recurrent and parabolic Collet-Eckmann rational functions. Przytycki, F.; Urbański, M. — 2001 Annales Academiae Scientiarum Fennicae. Mathematica