@article{BlasiusToenjes2005,
  author    = {Bernd Blasius and Ralf T{\"o}njes},
  title     = {Quasiregular concentric waves in heterogeneous lattices of coupled oscillators},
  url       = {http://www.agnld.uni-potsdam.de/~bernd/papers/prl1.pdf},
  year      = {2005},
}