Volume growth of quasihyperbolic balls
  The purpose of this paper is to study the notion of the quasihyperbolic volume and to find growth estimates for the quasihyperbolic volume of balls in a domain $G \subset {\mathbb R}^n\,$ in terms of the radii. 
Xiaohui Zhang, Riku Kl\'en, Ville Suomala, Matti Vuorinen
math.MG