%0 Journal Article %T Density of periodic sources in the boundary of a basin of attraction for iteration of holomorphic maps, geometric coding trees technique %A Feliks Przytycki %A Anna Zdunik %J Mathematics %D 1993 %I arXiv %X We prove that if A is the basin of immediate attraction to a periodic attracting or parabolic point for a rational map f on the Riemann sphere, then periodic points in the boundary of A are dense in this boundary. To prove this in the non simply- connected or parabolic situations we prove a more abstract, geometric coding trees version. %U http://arxiv.org/abs/math/9304217v1