B\"ottcher coordinates at superattracting fixed points of holomorphic   skew products
  Let $f : (\mathbb{C}^2, 0) \to (\mathbb{C}^2, 0)$ be a germ of holomorphic skew product with a superattracting fixed point at the origin. If it has a suitable weight, then we can construct a B\"ottcher coordinate which conjugates $f$ to the associated monomial map. This B\"ottcher coordinate is defined on an open set whose interior or boundary contains the origin. 
Kohei Ueno
math.DS