@article{AbelPikovskij1997,
  author    = {Markus Abel and Arkadij Pikovskij},
  title     = {Parametric excitation of breathers in a nonlinear lattice},
  url       = {http://www.stat.physik.uni-potsdam.de/~markus/papers/par.ps.gz},
  year      = {1997},
}