@article{Hammer2004a,
  author = "B. Hammer and A. Micheli and A. Sperduti and M. Strickert",
  title = "Recursive Self-organizing Network Models",
  year = 2004,
  journal = "Neural Networks",
  volume = 17,
  pages = "1061-1085",
  doi = "10.1016/j.neunet.2004.06.009",
  url = "https://www.sciencedirect.com/science/article/pii/S0893608004001510"
}