Shen, Liang et Wu, Sheng Jian, A note on a quadratic rational map with two Siegel disks, Acta mathematica Sinica. English series (Print) , 26(7), 2010, pp. 1393-1402
Suppose f(z) is a quadratic rational map with two Siegel disks. If the rotation numbers of the Siegel disks are both of bounded type, the Hausdorff dimension of the Julia set satisfies Dim (J(f) < 2.