@techreport{abi-las-pen-08,
  author = {P. Lassila and A. Penttinen},
  title = {Survey on performance analysis of cognitive radio networks},
  institution = {Helsinki University of Technology},
  month = {Dec.},
  year = {2008},
  url = {http://www.netlab.tkk.fi/tutkimus/abi/publ/cogsurvey2.pdf},
}