@article{KloedenKrasnoselʹskij2010,
  author    = {Peter E. Kloeden and Alexander M. Krasnoselʹskij},
  title     = {Periodic solutions of systems with asymptotically even nonlinearities},
  journal   = {Journal of applied mathematics and stochastic analysis},
  volume    = {vol. 13 (2000)},
  number    = {Issue 1},
  pages     = {41 -- 50},
  doi       = {doi:10.1155/S1048953300000058},
  year      = {2010},
}