@techreport{cost257td9849,
  author = {P. Lassila and J. Virtamo},
  title = {Importance Sampling for Monte Carlo Simulation of Loss Systems},
  institution = {COST257},
  number = {TD(98)49},
  month = {Sep.},
  year = {1998},
  url = {http://www.netlab.hut.fi/tutkimus/cost257/publ/composite.pdf},
}