Inclusion relations of hyperbolic type metric balls II
  Inclusion relations of metric balls defined by the hyperbolic, the quasihyperbolic, the $j$-metric and the chordal metric will be studied. The hyperbolic metric, the quasihyperbolic metric and the $j$-metric are considered in the unit ball. 
Riku Kl\'en and Matti Vuorinen
math.MG