Hereditarily Normal Wijsman Hyperspaces Are Metrizable
  In this paper, we study normality and metrizability of Wijsman hyperspaces. We show that every hereditarily normal Wijsman hyperspace is metrizable. This provides a partially answer to a problem of Di Maio and Meccariello in 1998. 
Jiling Cao and Heikki J. K. Junnila
math.GN