@techreport{cost257td00x2,
  author = {P. Lassila and J. Virtamo},
  title = {Nearly Optimal Importance Sampling for Monte Carlo Simulation of Loss Systems},
  institution = {COST257},
  number = {TD(00)},
  month = {Jan.},
  year = {2000},
  url = {http://www.netlab.hut.fi/tutkimus/cost257/publ/optis.pdf},
}