A hyperbolic multilayer perceptron
@InProceedings{buchholz00ijcnn,
  author = 	 {S. Buchholz and G. Sommer},
  title = 	 {A hyperbolic multilayer perceptron},
  booktitle = 	 {International Joint Conference on Neural Networks, IJCNN 2000, Como, Italy},
  pages =        {129-133},
  volume =       {2},
  publisher =    {IEEE Computer Society Press},
  editor = {S.-I. Amari and C.L. Giles and M. Gori and V. Piuri},
  year =	 2000,
  }