Fractional calculus and continuous-time finance II: the waiting-time   distribution
  We complement the theory of tick-by-tick dynamics of financial markets based on a Continuous-Time Random Walk (CTRW) model recently proposed by Scalas et al., and we point out its consistency with the behaviour observed in the waiting-time distribution for BUND future prices traded at LIFFE, London. 
Francesco Mainardi (1), Marco Raberto (2), Rudolf Gorenflo (3), Enrico   Scalas (4) ((1) University of Bologna, (2) Universi...