@techreport{cost257td9714,
  author = {J. Virtamo and S. Aalto},
  title = {Blocking probabilities in a transient system},
  institution = {COST257},
  number = {TD(97)14},
  month = {Jan.},
  year = {1997},
  url = {http://www.netlab.hut.fi/tutkimus/cost257/publ/tdblprob.pdf},
}