@techreport{cost257td9904,
  author = {E. Hyytiä and J. Virtamo},
  title = {Wavelength assignment in multifiber networks},
  institution = {COST257},
  number = {TD(99)04},
  month = {Jan.},
  year = {1999},
  url = {http://www.netlab.hut.fi/tutkimus/cost257/publ/rwamulti.pdf},
}